Phosphonoformate (PFA) at a concentration of 500 muM and higher completely inhibited the replication of cytomegalovirus (CMV) in cell culture. 50% inhibition was obtained at a concentration of muM PFA. Early nuclear CMV antigens appeared uninhibited, but the formation of nuclear inclusion bodies, late cytoplasmic antigens, Fc-receptors and CPE were all inhibited by PFA. No visible cell toxicity was noted at the PFA concentrations and exposure times used.
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Wahrén et al. (1979) studied this question.