title: A 27-nm virus isolated during an outbreak of acute infectious nonbacterial gastroenteritis in a convalescent hospital: a possible new serotype.
abstract: An outbreak of acute infectious nonbacterial gastroenteritis began among elderly patients in a convalescent hospital in Marin County in northern California in March 1978 and persisted through May 1978. The overall clinical attack rate was 51% of 187 residents and 12% of 180 employees. A 27-nm viruslike particle was observed by immune electron microscopy in stools obtained at or near the onset of illness from four of 32 patients. Seroresponses to the 27-nm particles were found by immune electron microscopy in 16 of 18 patients. In addition, serologic evidence of infection with this or a related agent was demonstrated in persons who developed illness in another large outbreak of acute infectious nonbacterial gastroenteritis which occurred in a nearby county. This agent is morphologically similar to but serologically unrelated to the Norwalk and Hawaii gastroenteritis agents and has been designated the Marin agent pending further classification.
mesh_terms: D000208:Acute Disease; D005243:Feces / Q000382:microbiology; D005759:Gastroenteritis / Q000382:microbiology*; D006525:Hepatitis, Viral, Human / Q000382:microbiology; D006507:Hepatovirus / Q000276:immunology; D006765:Hospitals, Convalescent; D007075:Immunoglobulin M; D008854:Microscopy, Electron; D012703:Serotyping; D014780:Viruses / Q000302:isolation & purification*
chemical_list: D007075:Immunoglobulin M