Chandipura specific IgM in sera of infected C3H/HeJ and C3H/CaJ mice. The level of IgM in the sera was determined by mouse IgM capture ELISA. The values are optical density (OD) at 490 nm wave length. The serum from three mice of infected as well as uninfected mice from C3H/HeJ and C3H/CaJ mice was processed separately in each time points. The values are Mean ± SE of three mice. Cut off value derived from mean OD of age matched uninfected control mice plus 3 standard deviation (SD).