CD40LG and infection: It is also possible that the rest of the livestock had already transitioned to an “IgG state” as RVF IgM antibodies last up to 8 weeks post infection [[27], [28], [29]].These high herd level seropositivities of sheep and goat flocks suggests they may be good sentinels for RVF surveillance; a finding that has been documented in other studies [[30], [31], [32], [33]].