<正> An ELISA indirect sandwich method using monoclonal antibodies（McAb）against hem-orrhagic fever with renal syndrome（HFRS）virus has been developed fordetections of HFRS virus antigen and specific antibody.Dynamic changes of HFRS virusantigens in the cells infected and their culture supernatants were observed by indirectfluorescence-antibody technique（IFAT）and ELISA separately.It was shown that HFRSvirus antigens in the cells and in the supernatants peaked separately 8 days and 14 daysafter infection.A hundred and seventy-nine brain and lung specimens of suckling miceinfected were examined by ELISA and IFAT.The positive rates were 72.1% and 68.2%

respectively.Furthermore

the IgM antibodies of 121 sera from HFRS patients wereexamined by ELISA and IFAT.The positive rates were 90.1% and 83.5% respectively.The IgG antibodies of 178 sera from HFRS patients were also examined by the twomethods

and both of the positive rates were 89.3%.The antibody titer measured byELISA was higher than the titer by IFAT.The above results suggest that the ELISA is aspecific and sensitive method and can be used for early diagnosis

epidemiologicalsurveillance and etiological study of HFRS.