[False negative reactions in the serodiagnosis of cystic echinococcosis in humans]

Clinically supposed cases of echinococcosis can be strongly confirmed by application of serodiagnostic techniques. In certain cases false-negative reactions have to be taken into account. This has been observed in 4 out of 51 parasitologically confirmed cases. One patient had a hyalin cyst, a case in which supposingly no antigen diffused into the host's system. In two cases the cysts were calcified, in one patient only no explanation could be given.