Objective To develop an indirect ELISA method for detection of Salmonella typhi antibody. Methods The condition for routine indirect ELISA,including antigen concentration for coating,dilution of serum to be tested,temperatures and times for coating,for reactions of coating antigen with serum and serum with enzyme-labeled secondary antibody and for blocking,as well as working mass concentration for enzyme-labeled secondary antibody,were optimized. The developed method was verified for sensitivity,precision,s...