CD34 and infection: CD34+ HPCs provide a critical reservoir of latent HCMV infection (Mendelson et al., 1996; Goodrum et al., 2004) and infection of HPCs contributes to the hematopoietic abnormalities observed in transplant patients (Reeves and Sinclair, 2008; Ljungman et al., 2011; Goodrum, 2016; Safdar and Armstrong, 2019).