The dynamic observation on the development of IgG/IgM antibodies before and after treatment of rabbit infection with Schistosoma japonicum using different kinds of schistosomal antigens.

To determine the diagnostic value as well as the evaluation value in therapy,the specific IgM and IgG anti-bodies of the infected and treated rabbits were detected using soluble egg antigen(SEA) and adult worm antigen(AWA) by ELISA.By using SEA to detect the IgM antibodies,the serum antibody level rapidly dropped 7 weeks after infection even without treatment,and those of IgM in sera detected by AWA rose early than IgG detected by SEA.After 5 month treatment,IgM detected by AWA and IgG detected by SEA were still positive.From these observations,it is evident that SEA is a better antigen to detect specific IgG in the diagnosis of schistosomiasis,AWA is a better one for early diagnosis.The use of AWA as antigen to detect IgM showed high diagnostic value both in acute and chronic schistosomiasis.However,detection of the IgM/ IgG in ELISA using SEA and AWA could not evaluate the therapeutic effect well.