PDGFRA and infection: HCMV TB40-BAC4 was diluted to an MOI ≤ 1 (resulting in less than 64% infection) and preincubated for 2 h at 37°C with various concentrations of the soluble gO receptor PDGFRα-Fc, anti-gB clone C23 or anti-pUL128 clone 4I22.