Viruses of the respiratory tract in Filipinos I. Para influenza types 1 and 3

In 279 serums of young adults with ages ranging from 12 to 24 tested by HI against para influenza types 3 and 1 viruses, incidence rates of 76% and 25% were obtained respectively after 20% had been deducted from each of the rates due to heterotypic responses. This is very suggestive of a widespread infection due to para influenza 3 in the Philippines. (Summary)