BCL6 and infection: Importantly, immune sera collected on 130 dpi from Bcl6 intact mice protected 6 of 9 (66.7%) AG6 mice from lethal ZIKV infection; in contrast, sera from Bcl6fl/flCd4-Cre mice or uninfected mice (PBS control) collected at the same time point failed to protect AG6 mice from weight loss (Fig. 4f), or death (Fig. 4g) after lethal infection.