IFNA1 and infection: Avirulent/low-virulent strains, that lack genes from MGF360 and MGF505, induce the expression of IFN during infection of macrophages in vitro (Afonso et al., 2004, Gil et al., 2008), whereas virulent ASFV strains do not (Afonso et al., 2004, Gil et al., 2008, Zhang et al., 2006).