[Temperature sensitive mutant of Herpes simplex virus type 1. I. Pathogenicity and immunogenicity].

The aim of the study was to characterize biological features of the sensitive mutant of HSV-1, derived from McIntyre strain by numerous virus passages at lowered replication temperature (28 degrees C). Pathogenicity of obtained ts mutant for inbred mice lines, CFW/Pzh and BALB/cPzh, was determined. Statistically significant decrease in virulence of the mutant for these mouse lines was demonstrated, as compared with the native virus strain, propagated at 37 degrees C. Immunogenic activity of ts mutant of HSV-1 defined by the possibility of mouse protection against infection with high virulent was determined. Mice, which at the time of immunization with ts mutant received Depo-Medrol--an immunosuppressive agent--were also found to be capable of inducing defense mechanisms to infection with the native strain.