CD209 and viral infectious disease: We and others have shown that the interaction between the S-layer of Lactobacillus acidophilus, one of the major bacterial species found in human intestines, and DC-SIGN can act as a potent inhibitor of JUNV and H9N2 viral infections (Martínez et al., 2012; Gao et al., 2016; Prado Acosta et al., 2016).