The cultured HUVE cells were infected with HFRS veruses. At different intervals after in-fection cytotoxicity of NK and LAK by 4 hours Cr release method. It was found that the infec-tion of endothelial cells inhibit the lytic activity of NK and LAK cells. Theinhibition. It is sug-gested that the deceased susceptibility of HFRS virus infected endothelial cells to NK and LAKcells may protect the viruses from the cellular immunity during the course of HFRS.
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