On the ground that the etiology of the most cases of acute upper respiratory infection are attributable to virus, authors carried out a series of immunologic and selogic test for a total of 55 adult cases with acute upper respiratory infection within the period of two years from January 1963 to December 1964.
Specimens which were collected from abovep atients for two dfferent occusions, one at the acute stage and the other at the convalescent stage, had been submitted for antigen-antibody reaction (antigens were influenza A, B, C, and adenovirus) and erythrocyteagulutination inhibiting test (parainfluenza type 1, 2, and 3 as antigens).
The significant elevation of the titer was observed in 9 cases, they were one case each in influenza A2, B1, and parainfluenza type 1 and 6 cases in cold agulutination.
