Evaluation of the intraoval precipitin reaction (IOP) for diagnosis of schistosomiasis.

On using lypholized eggs of S. mansoni isolated from mice, and that of S. haematobium isolated fresh from man. IOP was not observed and the sensitivity of (COP) was less in the former than in the latter. The IOP reaction should be taken into account when the ovum precipitin test is employed for schistosomiasis serodiagnosis and seroepidemiology, as being more sensitive than the COP reaction.