Abstract
Murine cytomegalovirus infection of spleen cultures induced the production of a small (<10,000 molecular weight) immunosuppressive factor (VISF), which suppressed concanvalin-A mitogenesis in fresh mouse spleen cells, and in fresh human peripheral blood leukocytes. The factor did not affect the growth of two murine T-cell lines or of mouse fibroblasts. A similar factor was also found in the serum of infected mice, at the time of maximum immune suppression. The properties of VISF indicate that the mechanism of MCMV immune suppression is different from that caused by several other viruses which are important in human and veterinary medicine.
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