[Serological variants of type 1 parainfluenza viruses]

A comparative study of the antigenic properties of parainfluenza type 1 viruses revealed the existence of 2 serological variants among them. The expedience of using the reference and recent years of isolates of parainfluenza type 1 viruses for serodiagnosis was demonstrated. Highly immunogenic strains isolated in 1971 were selected for properation of hyperimmune sera. It is necessary for identification of new isolates of parainfluenza type 1 viruses to use antisera for strains isolated in recent years alongside with reference immune sera.