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The virulence of 31 herpes simplex virus type 1 X herpes simplex virus type 2 intertypic recombinants was determined following intraperitoneal inoculation into CBA mice. Only eight of the recombinants killed any of the mice and of these, only one recombinant was as virulent as its type 2 parent, the other seven recombinants being intermediate between their type 1 and type 2 parental viruses in virulence. These results indicate that most heterotypic combinations are attenuated independently of the virulence of the parental viruses and therefore that the virulence of HSV is controlled multigenically.

Virulence Is not Conserved in Recombinants between Herpes Simplex Virus Types 1 and 2