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Vaccinia virus (VACV) strain WR can enter cells by a low pH endosomal pathway or direct fusion with the plasma membrane at neutral pH. Here, we compared attachment and entry of five VACV strains in six cell lines and discovered two major patterns. Only WR exhibited pH 5-enhanced rate of entry following neutral pH adsorption to cells, which correlated with sensitivity to bafilomycin A1, an inhibitor...