RSAD2 and infection: Kwasnik et al. [45] showed that infection with Influenza A virus (IAV) alters the profile of RNA in sEV secreted by infected cells by increasing the level of miRNA encoding RSAD2 (radical S-adenosyl methionine domain containing 2; virus inhibitory protein; viperin)—a host protein that inhibits viral replication of IAV [46], HIV [47], or HCV [48]).