Donoghue v Stevenson: The Snail, the Ginger Beer, and the Foundation of Every Duty of Care in Canadian Medical Malpractice Law

In August 1928, a woman in Paisley, Scotland drank ginger beer from an opaque bottle and fell ill. The bottle allegedly contained the decomposed remains of a snail. She had not bought the bottle herself; her friend had. She had no contract with the manufacturer. Under the law as it stood, she had no legal remedy.

Four years later, the House of Lords, by a majority of three to two, decided she was wrong about that. And in reaching that conclusion, it created (or more accurately, articulated for the first time in general form) the modern law of negligence.

Donoghue v Stevenson [1932] AC 562 is the most influential decision in the common law of tort. It did not merely resolve a dispute about a bottle of ginger beer in a Scottish café. It established the foundational principle that one person owes a legal duty of care to another whenever harm to that other person is reasonably foreseeable, regardless of whether any contract connects them, regardless of whether any previous court had recognized a duty in the same situation, and regardless of whether the particular type of harm had ever attracted legal liability before.

Every medical malpractice claim in Canada, every action against a physician who failed to diagnose a cancer, every suit against a surgeon whose error caused permanent disability, every claim against a hospital whose system failed a vulnerable patient, rests, ultimately, on the foundation that Donoghue v Stevenson built. Lord Atkin’s neighbour principle is the reason a physician owes a legal duty of care to their patient. Lord Macmillan’s declaration that “the categories of negligence are never closed” is the reason that duty has extended to every new form of healthcare as medicine has evolved.

This article examines the case in full: what the law was before it, who these people were and what happened to them, what each judge said and why it mattered, what the decision actually decided, and how the principle it established has developed in Canadian law, particularly in the physician-patient relationship and the broader landscape of healthcare liability.

The World Before Donoghue: A Law of Categories and Contracts

The Privity Limitation

To understand why Donoghue v Stevenson was revolutionary, it is necessary to understand what the law looked like before it. The common law of personal injury in the early twentieth century was not organized around a general principle of liability for fault. It was organized around specific, recognized categories of duty: categories that courts had identified, case by case, over decades, as situations where one person owed another a legal obligation of care. Outside those categories, there was no duty. Without duty, there was no negligence. Without negligence, there was no liability.

The most significant limiting principle was the doctrine of privity of contract. Following the English case of Winterbottom v Wright (1842), the prevailing rule was that an action in negligence for injury caused by a defective product could only be brought by a person in a direct contractual relationship with the responsible party. If you bought a product from a manufacturer, you might have a contract claim for defects. If someone else bought it for you and you were merely the end user, you had no contractual relationship with the manufacturer, and therefore, in the prevailing understanding of the law, no legal recourse against them.

There were exceptions. Courts had recognized duties of care in situations of specific, established relationships. But these were categories, not principles. A plaintiff who could not fit their situation into a recognized category had no claim. As the Second Division of the Court of Session observed in the case below, they felt “bound by their previous decision in Mullen v Barr & Co” (a case almost identical to Mrs. Donoghue’s except that the foreign matter in the ginger beer was a mouse, not a snail) and declined to extend the law beyond that precedent.

The State of Mrs. Donoghue’s Case Before the House of Lords

When Mrs. Donoghue’s case was first argued in the Scottish courts, her difficulty was precisely this categorical problem. She had consumed ginger beer manufactured by Stevenson. The bottle was opaque, dark glass that prevented anyone from seeing whether the contents were contaminated. After drinking some of the beer, the decomposed remains of a snail allegedly floated out when her friend poured the remainder into the tumbler. She suffered shock and severe gastroenteritis.

But it was her friend, not she, who had purchased the bottle from the café. The café owner, Minchella, had a contract with her friend. Her friend might have a contract claim against the café. Mrs. Donoghue had no contract with the café and no contract with Stevenson. Under the privity doctrine as it then stood, she appeared to be without a legal remedy: not because she had not suffered harm, and not because no one was at fault, but because the architecture of her relationships with the relevant parties did not fit the available legal categories.

The Lord Ordinary, Lord Moncrieff, allowed a proof; that is, permitted the case to proceed to a hearing on the evidence. But the Second Division of the Court of Session reversed him (the Lord Justice-Clerk, Lord Ormidale, and Lord Anderson in the majority; Lord Hunter dissenting) and dismissed the action, following their own earlier precedent in Mullen v Barr and McGowan v Barr. The case went to the House of Lords on the question of pure law: not whether there was a snail, not whether Stevenson was negligent, but whether, if everything Mrs. Donoghue alleged were true, she would have any legal right she could enforce.

The People: Mrs. Donoghue, Stevenson, and the Café in Paisley

Mrs. Donoghue

Mrs. Donoghue is described in the case headnote as “a shop assistant.” She was a working woman, and she is described in the formal legal record as a “pauper,” a legal designation indicating she was impecunious and entitled to have her case heard without the usual court fees (the case is formally styled “M’Alister (or Donoghue) (Pauper) v Stevenson”). The M’Alister name reflects her maiden name; she brought the action under her married name Donoghue.

Mrs. Donoghue did not attend the House of Lords proceedings, which turned entirely on legal argument. The facts she alleged (the opaque bottle, the decomposed snail, the gastroenteritis) were treated as assumed to be true. Whether they were in fact true was never established at trial, because the case was never tried on its merits. The House of Lords’ ruling was on the preliminary legal question only.

Stevenson

The respondent, Stevenson, was described in the case as “a manufacturer of aerated waters.” He had no direct dealings with Mrs. Donoghue and no knowledge of her existence at the time the ginger beer was bottled and labelled with his name. His defence was not that his product was safe, but that he owed no duty of care to the ultimate consumer, because no contractual relationship connected them.

The Incident: August 26, 1928

Lord Buckmaster’s speech in the CanLII document gives the specific date of the incident as August 26, 1928. On that evening, as described in the case averments, Mrs. Donoghue and her friend visited a café in Paisley occupied by one Minchella. Her friend ordered ice cream and a bottle of ginger beer for Mrs. Donoghue. The shopkeeper opened the bottle and poured some of the contents over the ice cream in a tumbler. Mrs. Donoghue drank some of the mixture. When her friend then proceeded to pour the remainder of the bottle’s contents into the tumbler, a decomposed snail floated out of the bottle. As a result of the nauseating sight and the impurities she had already consumed, Mrs. Donoghue suffered shock and severe gastroenteritis.

The bottle was made of dark opaque glass, so the condition of its contents could not be ascertained by inspection before opening. It had been sealed with a metal cap. The label bore the name of Stevenson, the manufacturer.

The House of Lords: Five Speeches, Three Votes, One Principle

The Question Before the Court

The House of Lords was not deciding whether Stevenson’s ginger beer contained a snail or whether he had been careless in its manufacture. It was deciding a preliminary question of pure law: assuming the facts as alleged by Mrs. Donoghue to be true, did they disclose a cause of action against the manufacturer? Could a person who was not in a contractual relationship with a manufacturer sue that manufacturer in negligence for harm caused by a defective product?

The argument presented a choice between two visions of what tort law was. The first, favoured by the dissenters, saw tort as a collection of specific, established duties, limited by the categories courts had previously recognized, and not to be extended without legislative action. The second, articulated by the majority, saw the established categories as specific instances of a general principle capable of extending to new situations wherever its underlying logic applied.

The formal holding of the majority is stated in the case headnote: “By Scots and English law alike the manufacturer of an article of food, medicine or the like, sold by him to a distributor in circumstances which prevent the distributor or the ultimate purchaser or consumer from discovering by inspection any defect, is under a legal duty to the ultimate purchaser or consumer to take reasonable care that the article is free from defect likely to cause injury to health.”

Lord Atkin: The Neighbour Principle

Lord Atkin delivered the leading majority judgment, and it is his speech that has had the greatest historical influence, not merely in the common law world but in legal thinking about duty, proximity, and the relationship between law and morality everywhere that English-language law has reached.

Lord Atkin began by searching for the general principle that he believed must underlie the specific categories of duty courts had previously recognized. He argued that there must be, and is, some general conception of relations giving rise to duty, of which the particular decided cases are merely instances. The liability for negligence is, he said, based upon a general public sentiment of moral wrongdoing for which the offender must pay.

He then delivered the passage that has been quoted in every significant negligence case in the common law world since 1932:

“The rule that you are to love your neighbour becomes in law, you must not injure your neighbour; and the lawyer’s question, Who is my neighbour? receives a restricted reply. You must take reasonable care to avoid acts or omissions which you can reasonably foresee would be likely to injure your neighbour. Who, then, in law is my neighbour? The answer seems to be: persons who are so closely and directly affected by my act that I ought reasonably to have them in contemplation as being so affected when I am directing my mind to the acts or omissions which are called in question.”

This passage, the neighbour principle, contains three interconnected elements that together define when a duty of care arises:

• Reasonable care: The standard required is not perfection but the care of a reasonable person
• Reasonable foreseeability of harm: The defendant must be able to reasonably foresee that their act or omission would be likely to injure the plaintiff
• Proximity: The plaintiff must be a person so closely and directly affected that the defendant ought reasonably to have them in contemplation, not every conceivable person who might be affected, but those sufficiently close that their welfare is a reasonable consideration in the defendant’s conduct

Lord Atkin drew explicitly on the biblical concept of loving one’s neighbour, translating it from a moral obligation into a legal one. The move was deliberate and significant. He was grounding the duty of care in a moral intuition that already commanded broad assent (the idea that we owe something to those who are affected by what we do) and articulating what legal form that moral obligation takes.

Applying the principle to Stevenson’s case, Lord Atkin found the answer clear. A manufacturer who produces articles of food and drink in sealed containers that will reach the ultimate consumer in the condition in which they left the manufacturer’s facility, without any reasonable opportunity for intermediate inspection, owes a duty of care to that ultimate consumer. The consumer is precisely the person the manufacturer ought to have in contemplation: the person their product is made for, the person who will be harmed if care is not taken. The neighbour principle, applied to these facts, produces liability.

Lord Atkin was also explicit about the direction his reasoning rejected. He found it impossible to accept that a manufacturer could poison a consumer through carelessness and face no legal liability simply because the consumer had not contracted directly with the manufacturer: “I do not think so ill of our jurisprudence as to suppose that its principles are so remote from the ordinary needs of civilized society and the ordinary claims it makes upon its members as to deny a legal remedy where there is so obviously a social wrong.”

Lord Macmillan: Categories Are Never Closed

Lord Macmillan wrote a separate concurring judgment, one that is, in its own way, as important as Lord Atkin’s for understanding the scope and development of negligence law.

Where Lord Atkin sought a sweeping general principle, Lord Macmillan was more incremental, building by analogy from existing cases. His focus was on the primary objection of Stevenson’s counsel: that the existence of a contract between Donoghue’s friend and the café precluded any tort claim by Donoghue herself. Lord Macmillan rejected this as a non-sequitur. The existence of one contractual avenue of redress does not preclude a different legal relationship between different parties.

Lord Macmillan then articulated what has become one of the most quoted propositions in the history of English-language negligence law:

“The grounds of action may be as various and manifold as human errancy; and the conception of legal responsibility may develop in adaptation to altering social conditions and standards. The criterion of judgment must adjust and adapt itself to the changing circumstances of life. The categories of negligence are never closed.”

And his statement of the cardinal principle was this:

“The cardinal principle of liability is that the party complained of should owe to the party complaining a duty to take care, and that the party complaining should be able to prove that he has suffered damage in consequence of a breach of that duty.”

Lord Macmillan reasoned that a person who for gain engages in the business of manufacturing articles of food and drink intended for consumption by members of the public is under a duty to take care in the manufacture of those articles, a duty owed to those he intends and contemplates shall consume his products. By placing his products on the market for public consumption, he places himself in a relationship with all potential consumers that imposes upon him a duty not to convert a wholesome article into a dangerous one through carelessness.

Lord Macmillan’s approach was cautious where Lord Atkin’s was bold. But the conclusion he drew, that the categories of negligence are never closed, was if anything more practically significant in the long run. It meant that the law of negligence could grow. New relationships could give rise to new duties. New technologies, new professional practices, new social institutions could all generate new legal obligations of care. The law was not frozen in the categories that existed in 1932.

Lord Thankerton: Concurring

Lord Thankerton agreed with both Lord Atkin and Lord Macmillan and provided the third vote for the majority. His reasoning focused on the manufacturer’s own action in bringing himself into direct relationship with the consumer: by specifically sealing and labelling his product so as to exclude intermediate inspection, Stevenson had, of his own accord, brought himself into direct relationship with the ultimate consumer. That direct relationship, on Lord Thankerton’s analysis, was the source of the duty.

Lord Buckmaster: The Dissent and Its Ironies

Lord Buckmaster dissented vigorously and at length. His dissent rewards attention because it shows exactly what the majority was arguing against, and because it contains a prediction about the consequences of the majority’s approach that, in the event, proved to be accurate in ways Lord Buckmaster intended as criticism.

Lord Buckmaster argued that extending liability to manufacturers for products consumed by non-contracting parties would represent an enormous and unjustified extension of the law, one unsupported by precedent and productive of unlimited future liability. His reasoning was that the existing cases (Winterbottom v Wright, Longmeid v Holliday, and others) had decisively closed the door on a general manufacturer’s duty to consumers, and that the courts had no power to reopen it. “The law applicable is the common law, and, though its principles are capable of application to meet new conditions not contemplated when the law was laid down, these principles cannot be changed nor can additions be made to them because any particular meritorious case seems outside their ambit.”

He asked, with pointed force, where such a principle would end: “If one step, why not fifty?” He concluded that if a manufacturer of ginger beer owed a duty to the ultimate consumer, there was no principled stopping point short of a builder who negligently built a house being liable to anyone injured when the ceiling fell. “Were such a principle known and recognized, it seems to me impossible, having regard to the numerous cases that must have arisen to persons injured by its disregard, that, with the exception of George v Skivington, no case directly involving the principle has ever succeeded in the Courts.”

The irony, which Lord Buckmaster would not live to appreciate fully, is that subsequent decades of common law development answered his rhetorical question in the affirmative. Builders can indeed be liable in negligence to the occupants of houses they negligently construct, under circumstances that the neighbour principle, properly applied, supports. The slippery slope Lord Buckmaster feared was not, in the event, an argument against the majority’s principle. It was a description of the territory that principle was about to govern.

Lord Tomlin’s speech was very brief. He said that the reasoning and conclusions reached in Lord Buckmaster’s opinion “accord in every respect with my own views,” and added only two points of his own: that Winterbottom v Wright necessarily embraced a claim in tort (not only in contract), and that he could not explain how the “dangerous articles” cases could have been treated as exceptions to a general principle if the appellant’s contention were correct.

What Donoghue v Stevenson Actually Decided — And What It Did Not

The Formal Holding

The formal holding of Donoghue v Stevenson was precise: a manufacturer who produces articles of food, medicine, or the like in sealed containers, intended for consumption by members of the public in the condition in which they are issued, owes a duty of care to the ultimate consumers of those products, even in the absence of any direct contractual relationship between manufacturer and consumer. Where a defect in the product causes harm to such a consumer, the manufacturer may be liable in negligence if the defect arose from a failure of reasonable care in manufacture. Mullen v Barr & Co and McGowan v Barr & Co (the “mouse in the ginger-beer” cases, 1929 SC 461) were overruled.

This was, in 1932, a significant extension of recognized liability. The privity limitation had blocked claims of exactly this kind. The decision removed that block, at least for the specific category of consumer products in sealed containers intended for the ultimate consumer without intermediate inspection.

The Broader Significance: A General Principle

But the formal holding understates what Donoghue actually contributed to the law. The lasting significance of the case is Lord Atkin’s neighbour principle and Lord Macmillan’s declaration that the categories of negligence are never closed. Together, these propositions transformed the law of negligence from a collection of specific duties into a general framework capable of generating new duties wherever the underlying conditions of foreseeability and proximity are satisfied.

Before Donoghue, a plaintiff suing in negligence had to show their case fit within an established category of duty. After Donoghue, a plaintiff could argue that even in a novel situation, the defendant owed a duty because the harm was reasonably foreseeable and there was sufficient proximity between the parties. The established categories remained relevant as recognized instances of duty (a plaintiff whose case fit within one did not need to argue from principle), but they were no longer the ceiling on liability. They were instances of a general principle capable of extension.

What Was Not Decided

Donoghue v Stevenson established the foundational principle but answered none of the hard questions that principle generates. It did not define precisely what foreseeability required or how much specificity was needed. It did not define proximity with precision, leaving that concept to be developed in subsequent cases. It did not address economic loss, psychiatric injury, omissions, or the liability of public authorities. And it said nothing directly about what policy considerations might limit or negate a duty that foreseeability and proximity would otherwise establish.

All of these limitations were noted and developed in the decades that followed. Donoghue gave the law of negligence a general framework. Filling in that framework has been the work of courts ever since.

The Development of Duty of Care After Donoghue: The Canadian Path

From Donoghue to Anns: The First Major Development

The neighbour principle was enormously influential but also, because of its breadth, somewhat unstable. Courts across the common law world struggled to define exactly how much proximity was required, what degree of foreseeability was sufficient, and when policy considerations would limit a duty that foreseeability and proximity otherwise supported.

The most significant development in the first decades after Donoghue came from the House of Lords in Anns v Merton London Borough Council [1977] 2 All ER 492. Lord Wilberforce’s judgment proposed a two-stage approach to duty of care that gave explicit structure to what the neighbour principle implied but did not spell out. Stage One asked whether there was a relationship of proximity or neighbourhood such that carelessness by the defendant was likely to cause damage to the plaintiff, and if so, whether a prima facie duty of care arose. Stage Two asked whether there were considerations that ought to negative, reduce, or limit the scope of the duty, the class of persons to whom it is owed, or the damages that flow from its breach. The Anns test explicitly built on Donoghue and did not purport to replace it.

The Canadian Adoption: Kamloops and Cooper v Hobart

Canada adopted the Anns approach in City of Kamloops v Nielsen, [1984] 2 SCR 2, where the Supreme Court of Canada expressly embraced the two-stage test for novel duty situations. The Kamloops decision confirmed that Canadian courts would not limit themselves to established categories of duty but would apply the Donoghue/Anns framework to assess whether duty should be recognized in new relationships.

The Canadian framework was refined and given its current form in Cooper v Hobart, 2001 SCC 79, [2001] 3 SCR 537, where the Supreme Court articulated what is now known as the Anns/Cooper test. The Court confirmed that Donoghue v Stevenson revolutionized the common law “by replacing the old categories of tort recovery with a single comprehensive principle: the negligence principle.” But it also recognized that the Donoghue principle needs structure to be applied in novel situations, and that the Anns two-stage analysis provides that structure.

Under the Anns/Cooper framework as it currently operates in Canada, two stages apply to novel duty situations. Stage One asks whether the harm was the reasonably foreseeable consequence of the defendant’s act, and whether there are reasons notwithstanding foreseeability that proximity sufficient to establish a prima facie duty should not be recognized. Proximity is assessed in light of the specific interactions between the parties, the expectations those interactions create, and the reliance the plaintiff placed on the defendant’s care. Stage Two asks whether there are residual policy considerations, beyond the relationship of the specific parties, that should negative the imposition of the duty or limit its scope.

An Important Practical Point: Established Duties Do Not Need the Anns/Cooper Analysis

One of the most practically significant aspects of the Canadian duty of care framework is this: the Anns/Cooper two-stage analysis applies only to novel duty situations: cases where the existence of a duty has not been previously established by the courts. Where the relevant duty is already recognized in the case law, a plaintiff need not go through the full Anns/Cooper analysis. As the Supreme Court confirmed in Cooper v Hobart: “If a case falls within a previously recognized duty of care, there is no need for the prima facie analysis.” Established categories of duty stand until overruled. The Anns/Cooper test is for the frontier: for cases where a plaintiff asks a court to recognize a duty not formally established before.

Donoghue v Stevenson and the Physician-Patient Duty of Care

The Most Well-Established Duty in Medical Malpractice

The duty of care between a physician and their patient is one of the longest-recognized and most firmly established duties in the common law. It predates Donoghue v Stevenson by decades; courts were recognizing that physicians owed duties of care to patients long before Lord Atkin articulated the neighbour principle. But Donoghue provides the general framework that explains why that duty exists and what it rests on.

A physician who agrees to assess and treat a patient stands in exactly the relationship Lord Atkin described: the patient is a person so closely and directly affected by the physician’s acts and omissions that the physician ought reasonably to have the patient in contemplation in everything they do. The harm of negligent diagnosis, negligent treatment, or failure to exercise appropriate care is precisely and specifically foreseeable. The relationship could not be more proximate.

Because the physician-patient duty of care is so well established, Canadian courts do not apply the Anns/Cooper two-stage analysis when a patient sues their physician for malpractice. The duty exists. It has been recognized countless times. The question in any medical malpractice case is not whether a duty exists, but what the applicable standard of care requires and whether it was met.

For the governing formulation of the standard of care in Canadian medical malpractice law, see the companion article in this series on Crits v Sylvester, 1956 CanLII 34 (ON CA), affirmed 1956 CanLII 29 (SCC) — https://canlii.ca/t/1tvmv.

The Extension to All Healthcare Providers

Lord Macmillan’s declaration that “the categories of negligence are never closed” is what allows the duty of care to extend beyond physicians to every other form of regulated and in many cases unregulated healthcare. It explains why surgeons, anaesthesiologists, nurses, chiropractors, physiotherapists, radiologists, pharmacists, and a range of other healthcare providers all owe duties of care to those they serve.

Each of these duty relationships can be understood through the neighbour principle. A radiologist who reads a scan is in a relationship of proximity and foreseeability with the patient whose scan is being read; the diagnosis or misdiagnosis is precisely what will affect that patient. A pharmacist who dispenses medication is in a relationship of proximity and foreseeability with the patient who will consume it. A physiotherapist who administers treatment is in a relationship of proximity with the patient receiving it. In each case, the failure to exercise reasonable care is reasonably foreseeable as likely to cause harm to a person so closely and directly affected that their welfare ought to be in the practitioner’s contemplation.

The Importance of “Who Is My Neighbour” in Novel Healthcare Relationships

As healthcare has evolved, as new therapies, new technologies, new types of practitioners, and new institutional arrangements have emerged, the question of who owes a duty of care to whom has continued to require the application of Donoghue’s neighbour principle to novel situations. The Anns/Cooper test becomes relevant precisely at the frontier of recognized duties. As each new form of healthcare practice emerges, courts applying the Anns/Cooper framework must ask, through the lens of the neighbour principle, whether those who provide care in these new forms stand in a sufficient relationship of foreseeability and proximity with those they serve to give rise to a legal duty of care. In virtually every case where a practitioner has agreed to provide care and a patient has relied on that care, the answer is yes. Lord Atkin’s question, “Who is my neighbour?”, and Lord Macmillan’s answer, “The categories of negligence are never closed,” remain the tools through which that determination is made.

The Hospital and Institutional Duty

Donoghue’s principle also explains why hospitals and health authorities bear duties of care that extend beyond the acts of individual practitioners. A hospital that admits a patient creates a relationship of proximity and foreseeability with that patient in relation to the institutional aspects of care: the systems for monitoring, the communication protocols for test results, the staffing decisions that affect the quality of nursing care, the maintenance of equipment, the credentialing of practitioners. All of these are things the hospital does, and the effects of doing them carelessly are reasonably foreseeable as likely to injure the patients who depend on them.

This is the manufacturer-consumer relationship from Donoghue transposed to the institutional healthcare context. Just as Stevenson’s care in bottling his ginger beer affected Mrs. Donoghue even without a direct contractual relationship between them, a hospital’s care in operating its systems affects patients even when those patients’ primary relationship is with the individual physician rather than the institution directly. The neighbour principle reaches through the institutional structure to impose duty wherever the conditions of foreseeability and proximity are met.

The Enduring Significance of Donoghue v Stevenson

What the Case Gave the Law

Donoghue v Stevenson gave the common law of negligence three things it did not previously have in coherent form.

First, a general principle. Before Donoghue, duty of care existed in specific categories. After Donoghue, duty of care existed wherever reasonable foreseeability and proximity were present. The specific categories remained as established instances of a general principle, but the law was no longer confined to them. This shift from categorical to principled reasoning transformed how courts could develop the law in response to new social, technological, and professional realities.

Second, the neighbour principle as a moral and legal anchor. Lord Atkin’s grounding of legal duty in the moral concept of neighbourliness (taking care of those who are affected by what we do) gave the law of negligence a moral foundation that commands genuine assent. The principle resonates because it reflects something ordinary people already believe: that we owe something to those affected by our conduct, and that failing to take reasonable care of them is morally wrong as well as legally actionable.

Third, an open system. Lord Macmillan’s declaration that the categories of negligence are never closed meant that the law could grow. As society changed, as new technologies created new risks, as new professional relationships created new dependencies, new duties could be recognized through the application of the neighbour principle. The law of negligence has been growing in this way ever since 1932, and the healthcare context is one of the areas where it has grown most significantly.

A Note on What the Snail Represents

The case is almost universally known as “the snail in the bottle case” or “the Paisley snail case.” The snail, the alleged, never-confirmed decomposed snail in Mrs. Donoghue’s ginger beer, has become one of the most famous objects in the history of law. It represents something far larger than itself: the moment at which the law stopped asking “what category does this fit?” and started asking “was this person owed reasonable care?”

Donoghue v Stevenson has been cited with approval in courts across Canada, England, Australia, New Zealand, Hong Kong, India, and every jurisdiction that inherited the English common law tradition. It has influenced the development of negligence law in every area from product liability to professional malpractice to public authority liability to psychiatric injury. The snail, whatever it was, started something. More than ninety years later, it has not finished.

Conclusion: Why Every Canadian Medical Malpractice Claim Rests on This Foundation

The duty of care that a physician owes their patient did not begin with Donoghue v Stevenson. But Donoghue is the case that explains, in principle, why that duty exists, and it is the principle that has allowed the duty to extend, through the evolution of medical practice and healthcare delivery, to every form of healthcare relationship that exists today.

When a patient sues a radiologist who misread their scan, the claim rests on the duty established by the neighbour principle: the radiologist is someone whose acts directly affect the patient in reasonably foreseeable ways, someone who ought to have the patient in contemplation when interpreting their images. When a patient sues a hospital for a systemic failure in its test result communication, the claim rests on the same principle. When a patient sues a physiotherapist for a carelessly administered treatment, the claim rests on it too.

The four elements of every medical malpractice claim (duty of care, breach of the standard of care, causation, and harm) begin with duty. And duty begins with Lord Atkin’s question: “Who, then, in law is my neighbour?” The answer, persons so closely and directly affected that we ought to have them in contemplation, is the foundation on which everything else is built. It is the foundation of Canadian negligence law. It came from a bottle of ginger beer in a café in Paisley on August 26, 1928.

Quick Reference: Donoghue v Stevenson

Case Details

• CanLII: Donoghue v Stevenson, 1932 CanLII 536 (FOREP), [1932] AC 562 — https://canlii.ca/t/gghx0
• Other citations confirmed in CanLII: [1932] All ER Rep 1 — 48 TLR 494
• Also styled: M’Alister (or Donoghue) (Pauper) v Stevenson
• Argued: December 10–11, 1931 | Decided: May 26, 1932
• Court: House of Lords | 3–2 majority
• Majority: Lord Atkin, Lord Thankerton, Lord Macmillan
• Dissent: Lord Buckmaster (with whom Lord Tomlin’s reasoning accorded in every respect)
• On appeal from: Second Division of the Court of Session, Scotland (majority: Lord Justice-Clerk, Lord Ormidale, Lord Anderson; Lord Hunter dissenting)
• Note: Filed on CanLII as a Foreign Reported Decision (FOREP); binding in Canada as the foundational authority for duty of care in all negligence actions

The Parties

• Appellant: Mrs. Donoghue (M’Alister), described in the case as “a shop assistant,” sued in forma pauperis (“pauper”)
• Respondent: Stevenson, described as “a manufacturer of aerated waters”
• Café owner: Minchella (occupying a café at Paisley where the ginger beer was served)

Facts in Brief

• August 26, 1928: Mrs. Donoghue’s friend ordered ice cream and a bottle of ginger beer (manufactured by Stevenson) at a café in Paisley, Scotland, occupied by one Minchella
• The shopkeeper opened the bottle and poured some of the contents over the ice cream in a tumbler; Mrs. Donoghue drank some of the mixture
• When the friend poured the remainder, a snail in a state of decomposition floated out of the bottle
• The bottle was made of dark opaque glass; the condition of the contents could not be ascertained by inspection; it was sealed with a metal cap and bore Stevenson’s label
• Mrs. Donoghue suffered shock and severe gastroenteritis
• No contractual relationship existed between Mrs. Donoghue and Stevenson; the friend’s contract was with Minchella’s café
• The case was argued as a preliminary legal question, namely whether the facts, if proved, disclosed a cause of action; the underlying facts were never established at trial

The Formal Holding (from the case headnote)

• “By Scots and English law alike the manufacturer of an article of food, medicine or the like, sold by him to a distributor in circumstances which prevent the distributor or the ultimate purchaser or consumer from discovering by inspection any defect, is under a legal duty to the ultimate purchaser or consumer to take reasonable care that the article is free from defect likely to cause injury to health”
• George v Skivington (1869) approved
• Mullen v Barr & Co and McGowan v Barr & Co, 1929 SC 461 (the “mouse in the ginger-beer” cases) overruled

The Neighbour Principle (Lord Atkin)

• “You must take reasonable care to avoid acts or omissions which you can reasonably foresee would be likely to injure your neighbour. Who, then, in law is my neighbour? The answer seems to be—persons who are so closely and directly affected by my act that I ought reasonably to have them in contemplation as being so affected when I am directing my mind to the acts or omissions which are called in question.”

The Two Foundational Elements of the Duty of Care

• Reasonable foreseeability: Was it reasonably foreseeable that the defendant’s act or omission would cause harm to this plaintiff or class of plaintiff?
• Proximity: Is the plaintiff a person so closely and directly affected by the defendant’s conduct that the defendant ought to have the plaintiff in contemplation when directing their mind to what they are doing?

Key Propositions

• Negligence is an independent tort, a general principle, not merely a collection of specific duty categories
• A duty of care can exist in the absence of any contractual relationship between the parties
• “The categories of negligence are never closed” (Lord Macmillan); new duties may be recognized in novel situations where foreseeability and proximity are satisfied
• “The cardinal principle of liability is that the party complained of should owe to the party complaining a duty to take care, and that the party complaining should be able to prove that he has suffered damage in consequence of a breach of that duty.” (Lord Macmillan)
• The law of negligence is capable of growth in adaptation to altering social conditions and standards

The Canadian Evolution: Donoghue to Anns/Cooper

• Donoghue (1932): General neighbour principle, with foreseeability and proximity as foundations of duty
• Anns v Merton LBC (1977, HL): Two-stage test; prima facie duty from proximity and foreseeability; policy reasons may negate or limit
• City of Kamloops v Nielsen, [1984] 2 SCR 2 (SCC): Canada adopts the Anns two-stage framework
• Cooper v Hobart, 2001 SCC 79, [2001] 3 SCR 537 (SCC): Anns/Cooper test, the current Canadian framework for novel duty situations: (1) foreseeability and proximity → prima facie duty; (2) residual policy considerations → may negate or limit
• Established duties: The Anns/Cooper analysis applies only to novel duty situations; where a duty is already established by prior case law, plaintiffs rely directly on that established duty without applying the two-stage test

Application to Healthcare and Medical Malpractice

• The physician-patient duty of care is one of the most firmly established duties in Canadian negligence law; courts do not apply the Anns/Cooper analysis when a patient sues their physician; the duty is accepted without analysis
• The neighbour principle explains why the duty extends to all healthcare providers in relationships of sufficient proximity and foreseeability: surgeons, anaesthesiologists, nurses, chiropractors, physiotherapists, radiologists, pharmacists, and others
• Lord Macmillan’s “categories of negligence are never closed” is the basis on which duty has been and will continue to be extended to new healthcare relationships and new forms of medical practice as they emerge
• Hospitals and health authorities bear duties of care under the neighbour principle for the systemic aspects of their operations (their systems, staffing, protocols, and equipment), not only for the acts of individual practitioners
• For the governing formulation of the standard of care once duty is established, see: Crits v Sylvester, 1956 CanLII 34 (ON CA), affirmed 1956 CanLII 29 (SCC) https://canlii.ca/t/1tvmv