[Influenza C: the immunological aspects of the problem]

The use of the complex of methods for the characterization of cell-mediated and humoral immunity to influenza C virus has made it possible to establish that with the increase of the age of children and, simultaneously, with the increase of the number of persons found to be seropositive to influenza C the asymptomatic forms of this infection occur more frequently. Practically all examined adults selected by random choice have proved to be immune to this infective agent. The results of this investigation indicate that influenza C virus constantly circulates among the population.