Prevalence in England of antibody to human polyomavirus (B.k.).

Over 500 human sera were tested by complement fixation and haemagglutination inhibition tests for antibody to the human polyomavirus (B.K.). Both tests showed that antibody to this virus was very common in the population and began to be acquired after the age of 1 year. No clinical illness has so far been associated with the development of this antibody in a series of paired sera from children.