The plaintiff, an Irish immigrant traveling in steerage from Queenstown to Boston aboard a Cunard steamship, alleged that the defendant's ship surgeon committed a battery by vaccinating her without consent. At the time, immigration authorities commonly required arriving passengers to present proof of vaccination or to be vaccinated before landing. On board, the ship's surgeon announced that those without satisfactory proof should be vaccinated. The plaintiff joined a line of female passengers, approached the surgeon when called, and, after the customary inquiries, raised or held out her arm. The surgeon performed the vaccination without hearing any objection from her, and she did not withdraw or resist. After disembarkation, she sued the steamship company (as the surgeon's employer) for assault and battery, claiming she had been previously vaccinated and did not truly consent, but felt compelled because she was told vaccination was required for landing. The trial court directed a verdict for the defendant. The plaintiff sought appellate review.
Whether a passenger's conduct—standing in line for vaccination, approaching the surgeon, and exposing her arm without objection—constitutes consent to the procedure sufficient to defeat a battery claim, notwithstanding her unexpressed reluctance or belief that vaccination was required to land.
Battery is an intentional and unpermitted contact that is harmful or offensive. Consent is a complete defense to battery and may be manifested expressly or impliedly through conduct and the surrounding circumstances. The existence of consent is judged objectively from the perspective of a reasonable person in the actor's position; undisclosed, subjective reservations do not vitiate consent reasonably inferred from a person's words, acts, and silence in context.
Yes. The plaintiff's conduct objectively indicated consent to the vaccination, and the surgeon was justified in proceeding on that basis. Because the contact was consented to, no battery occurred. The directed verdict for the defendant was affirmed.
The court emphasized that consent need not be verbal and may be inferred from behavior and context. Here, the plaintiff joined other passengers in a vaccination line after the surgeon announced the procedure for those lacking proof. She approached when called, made no protest, and presented her arm for the inoculation. Those actions communicated assent to a reasonable person in the surgeon's position. The court rejected the argument that the plaintiff's private unwillingness or her belief that vaccination was required to land converted the procedure into a nonconsensual touching. The relevant question is what her conduct reasonably conveyed, not what she silently wished. The court also noted that the surgeon acted within the scope of the apparent permission—performing only the vaccination described—and did not exceed any consent given. Under these circumstances, the contact was not offensive or unpermitted. Accordingly, there was no battery and, thus, no tort liability for the shipowner based on the surgeon's act.
O\'Brien is a cornerstone case for the defense of consent in intentional torts and for the objective theory of consent. It teaches that consent may be implied from overt acts, silence, and situational context, and that uncommunicated reservations are legally irrelevant where conduct signals assent. For students examining personhood and property themes, O\'Brien highlights how tort law protects bodily integrity yet pragmatically relies on objective manifestations to guide social and institutional interactions (e.g., public health processes). The case is frequently paired with later informed consent cases to contrast battery-based theories (focused on permission to touch) with negligence-based informed consent (focused on disclosure and decision-making quality).
O\'Brien v. Cunard teaches that the law of battery turns on permission, and permission can be communicated without words. By analyzing consent through an objective lens, the court balanced personal sovereignty over the body with the practical need for others to rely on observable signals in dynamic settings like public health screening.