to determine risk factors for outbreaks of influenza virus infections in chronic-care facilities for the elderly , the authors compared the characteristics of two groups of nursing homes in genesee county , michigan , in 1982-1983 , following a community-wide epidemic caused by a/bangkok/1/79-like ( h3n2 ) viruses : seven homes in which an outbreak occurred ( case homes ) and six homes with sporadic illnesses only ( control homes ) .
C3814501
genesee county
C0025939
michigan