| an influenza a (h1n1) virus, closely related to swine influenza virus, responsible for a fatal case of human influenza. | in july 1991, an influenza a virus, designated a/maryland/12/91 (a/md), was isolated from the bronchial secretions of a 27-year-old animal caretaker. he had been admitted to the hospital with bilateral pneumonia and died of acute respiratory distress syndrome 13 days later. antigenic analyses with postinfection ferret antisera and monoclonal antibodies to recent h1 swine hemagglutinins indicated that the hemagglutinin of this virus was antigenically related to, but distinguishable from, those of ... | 1994 | 8138990 |