PDGFRA and cytomegalovirus infection: Even the least potent of the combination mutants, PDGFRα-Fc I139E + Y206S + V242K, fully blocked HCMV infection at 2000 ng/ml, while no binding to PDGF was observed even at the highest concentration tested (720,000 ng/ml = 4.35×10−6 nmol/l).