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Treatment of herpes simplex virus type 2 (HSV-2)-infected human fibroblast cells with cytosine arabinoside (ara-C) at 25 microgram/ml resulted in complete inhibition of virus replication. Removal of ara-C after 7 days of treatment ultimately resulted in renewed virus replication, but after a delay of at least 5 days. If however, the temperature was elevated from 37 degrees C to 39.5 to 40 degrees C at the time of ara-C reversal, infectious HSV-2 did not reappear. As long as the cultures were maintained at 39.5 to 40 degrees C (up to at least 128 days), HSV-2 was latent and infectious virus was undetectable. If the temperature was reduced to 37 degrees C at any time during the latent period, infectious virus was always reactivated, but only after a period of incubation at 37 degrees C of a least 11 days. Infectious-center assays performed with latent cultures indicated that only a very small fraction of cells could reactivate virus. The infectious-center titer did not show significant changes during much of the period of latency. This seemed to argue against the possibility that the latent cultures were synthesizing very small amounts of infectious virus. Additional studies were aimed at determining the minimum incubation period at 37 degrees C required to reactivate infectious HSV-2. Latent cultures reduced from 39.5 to 40 degrees C to 37 degrees C for less than 96 h did not yield infectious HSV-2, but those incubated at 37 degrees C for 96 h or more did.

Prolongation of herpes simplex virus latency in cultured human cells by temperature elevation