A Serologic Survey of Influenza and APC Virus Infections

Abstract
A third survey for respiratory virus antibodies in random sera from residents of upstate New York was made during the winter of 1954-1955. In addition to influenza A and B, the specimens were tested for complement-fixing antibodies for the APC (adenoidal-pharyngeal-conjunctival) group of viruses. The quantitative complement-fixation test devised by Wadsworth and Maltaner was used, with modifications. The specimens were portions of sera that had been submitted for tests for syphilis and had not reacted with cardiolipin antigen. Evidence of sporadic influenza A and influenza B virus infections was obtained. APC virus antibodies were more frequently found.