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The blood of 1876 citizens of Gothenburg aged 5, 8, 13, 25 and 50 years of age was examined for the presence of neutralizing antibodies to the three types of poliomyelitis virus. The selected subjects in the three youngest age groups, at least, were well representative of the city's population of these age groups. In all the groups the incidence of immunity(More)
Thirty infants were fed CHAT vaccine after 2 or 3 injections of formalinized vaccine. All infants had homologous antibodies at the time of feeding with the live vaccine. The antibody level at the time of feeding seemed to influence the length of the excretion period. Six of the infants did not excrete vaccine virus. They belonged to the lower age group and(More)
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