A hospital outbreak due to XXXX .

@entity1 @entity294 @entity391 @entity43939 @entity1800
An outbreak of @entity294 and @entity391 began at a hospital for the elderly on the 25 October 1991. The symptoms and pattern of spread suggested a viral aetiology from a point source. Electron microscopy confirmed the presence of @entity43939 . The first wave of illness affected 37 @entity1 and 28 staff. Secondary cases occurred on all wards. Analytical studies of food consumed at three lunchtime meetings by staff and visitors to the hospital demonstrated a clear association between eating sandwiches and subsequent illness. The source of the outbreak was probably a food handler involved in the preparation of sandwiches. Control measures were implemented and the outbreak was declared over on the 11 November 1991. At this time 95 @entity1 and 69 staff (including six visitors) had been affected. The implications for the future investigation and prevention of outbreaks of @entity1800 in closed communities are discussed. An audit of the action taken during the outbreak resulted in the development of standards for the investigation and control of local outbreaks.
