VEGFA and infection: In addition, homologs of vascular endothelial growth factor (1193), shown to stimulate blood vessel proliferation underlying the site of infection (Savory, Stacker, and Fleming et al., 2000), are found in a mammalian subclade of Chordopoxvirinae (Parapoxvirus, including bovine papular stomatitis virus and orf virus) and fish-infecting Megalocytivirus in Alphairidovirinae.