Abstract
A total of 122 adenovirus type 4 (Ad4) strains isolated from patients with epidemic keratoconjunctivitis at an eye clinic in Sapporo, Japan, from 1985 to 1989 were identified as Ad4a. By the use of HinfI and TaqI restriction endonucleases, these Ad4a strains were classified into 12 subgenome types. During this observation period, two epidemics of Ad4 infection relating to epidemic keratoconjunctivitis occurred. During the Ad4a epidemic in 1985, three subgenome types became predominant successively. However, except for one strain, the prevalent strains isolated during the epidemic of Ad4a in 1988 all belonged to a single subgenome type. In the years when an Ad4a epidemic was not observed, such Ad4a strains were new or previous subgenome types. The prevalent subgenome types tended to change within several years.
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