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The response of institutionalized Down's syndrome subjects to enterovirus infections

SUMMARY In a study comparing the responses of institutionnalized Down's syndrome (DS) and non-Down's (ND) inmates to enterovirus infections, the frequency of wild enteric viruses and the excreation patterns of oral polio vaccine (OPV) viruses were similar in both groups. Antibody titres developed to poliovirus types 2 nad 3 following vaccination were similar in DS and ND and ND vaccinees, but the responses to type I virus was signifcantly less in DS vaccinees. As judged by the development of poliovirus antibody in non-vaccinees, the spread of virus from OPV-immunized to unimmunized subjects in the institution was not noticeably different in DS and ND subjects. An unexpected finding was that the excretion patterns of all three serotypes of poliovirus were strikingly similar for each individual to individual. The similarity of excreation occurred despite wide differences within an individual in the titres of neutralizing serum antibodies to the three serotypes. It is suggested that the rate at which a given individual eliminates enteroviruses may be largely determined by factors, the activities of which atre not reflected in serum antibody titres.