ABSTRACTAIDS raises the moral problem of confidentiality because those in sexual contact with the patient may contract a life‐threatening and incurable disease. Medicine has a tradition in which a patient's condition is regarded as confidential information held by the doctor alone. In this case there is a clear moral inclination to inform those at risk from the disease. In most cases no problem will arise but when it does the moral justification for a violation of confidentiality comes into question. Confidentiality is important because of our respect for certain human values and their importance to our patient. Where that patient acts so as to disregard the welfare of others with whom they are in close relationship, those values are lacking. This lack warrants a departure from our normal canons and provokes a suspension of normal moral privileges. The contention that any transgression, however slight, could be held to justify such a response posits a slope down which we, in fact, have no tendency to slid