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Infectivity of CHIKV vaccine strain 181/25 (A&B) or 37997-mCherry (C&D) was neutralized by serum from surviving IFNαR-/- mice (A&C) at 3 weeks after CHIKV 181/25 and CHIKV 37997-mCherry infection and (B&D) at 11 days post-challenge with CHIKV LR.
