a1 Department of Virology, Public Health Laboratory, John Radcliffe Hospital, Oxford OX3 9DU, UK
Results of serotyping on 291 astrovirus-positive stools collected between 1976 and 1992 showed that about two-thirds (64.9%) were serotype 1. Infections were more frequent in the fourth quarter of the year and there was a suggestion that during the past 5 years serotype 1 has occurred with greater frequency in alternate years. Evidence is provided for the existence of two new serotypes, 6 and 7.
(Accepted August 24 1993)
c1 Author for correspondence.