CD209 and infection: The G protein of hMPV plays a crucial role in the initial stages of infection by interacting with heparan sulfate proteoglycans (HSPGs) (Thammawat et al., 2008; Chang et al., 2012), dendritic cell-specific intercellular adhesion molecule-3-grabbing nonintegrin (DC-SIGN) and liver/lymph node-specific intercellular adhesion molecule-3-grabbing nonintegrin (L-SIGN) (Le Nouën et al., 2014; Gillespie et al., 2016).