C9 and infection: To compare neutralizing activity of DC2.271B and DC2.429 with the most efficacious of the previously reported human mAbs [30, 31], we generated versions of C9, IM-CKV063 and 4N12 (parent of SINV001) expressed from the pMAZ platform (C9pMAZ, IM-CKV063pMAZ, and 4N12pMAZ) and assessed their capacity to neutralize CHIKV 181/25 infection.