Characterization of mouse monoclonal antibodies against chikungunya virus (CHIKV) by an immunofluorescence assay. Four CHIKV strains were included (Thai, SL11131, S27, and SBY). SV, Sindbis virus; DENV2, dengue virus serotype 2; JEV, Japanese encephalitis virus. Alphavirus antibody, Santa Cruz Sc-293153; flavivirus antibody, 4G2; anti-flavivirus monoclonal antibody; anti-CHIKV antibody, ATCC VR-1241AF (CHIKV immune ascetic fluid).