Objective To develop an ELISA in quantitative determination of filamentous hemagglutinin(FHA) in DTaP(diphtheria,tetanus and acellular pertussis combined vaccine,adsorbed).Methods The high potency antisera for FHA were obtained by using FHA immunized rabbit,the polyclonal antibody was purified by capric acid and ammonium sulphate precipitation,the antibody was coupled to horseradish peroxidase(HRP)by periodate oxidase method in order to develop a double antibody sandwich ELISA in quantitative determination ...