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Serum and secretory antibody levels against 3 types of parainfluenza virus were determined in persons ranging in age from 1 month to 74 years. With a slight decline in the group of 7 months to 2 years of children, the number of positive findings increased with age, reaching maximum in the groups of 16-24 years [types 1 and 2] and 25-74 years [type 3] old persons. Nasal secretory antibodies against parainfluenza type 3 virus were detected in all age categories, the highest number of positive findings occurred in the group of 16-24 years old persons. Secretory antibodies against type 2 virus were detected also in all age groups, but the number of positive findings was considerably lower. Secretory antibodies against type 1 virus were detectable in persons over 5 years of age, with a maximum in the age category of 16-24 years. The percentage of positive persons with antibody to type 1 virus was the lowest.
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