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Further characterization of the viral enhancement system of varicella-zoster virus by the pesticide carbaryl (1-naphthyl-N-methylcarbamate) is presented. It was necessary to expose cells to the enhancing chemical during the period of virus replication to detect enhancement. The optimum time for the pretreatment is 20 to 24 h. Maximum enhancement of virus expression occurs 48 to 72 h post-inoculation. Treated cells cannot pass on to daughter cells the ability to produce increased amounts of virus. alpha-Naphthol, a metabolite of carbaryl, is also capable of enhancing virus replication; Guthion, another pesticide tested, did not enhance varicella-zoster virus. The stable cell line HEP-2 can be used in place of human embryonic lung cells to detect enhancement. Differences in enhancement levels were not due to cell lot, cell passage, or a change in the stability of the cell membrane to sonic disruption.

Characterization of varicella-zoster virus enhancement by the pesticide carbaryl