[Changes in the sulfhydryl group content in the hemolymph of freshwater gastropods infected with trematode parthenitae and larvae].

A study was conducted on the changes in sulphhydryl groups in the haemolymph of Lymnaea stagnalis infected with partenites of Opisthioglyphe ranae, Planorbis corneus infected with partenites of Cotylurus cornutus and females of Viviparus viviparus infected with partenites and larvae of Echinoparyphium petrowi. At the infection in the haemolymph of hosts were recorded statystically reliable changes in the protein sulphhydryl groups which are blocked by toxines excreted by the parasites. The reduction rate in the content of these substances depends on the localization of the parasites and infection intensity of the hosts.