Effect of Praziquantel on Hatching of Schistosoma haematobium Eggs

The hatchability of Schistosoma haematobium eggs excreted by patients treated with praziquantel (PZQ) was examined. The rate of hatching of the eggs excreted by the patients before treatment was 90.1%. The rates of hatching of the eggs excreted by the patients 3 hr, 24 hr and 48 hr after treatment were 25.5%, 19.2% and 29.9% respectively. In vivo PZQ inhibits the hatching of S. haematobium eggs. The result of in vivo experiment was strongly supported by the results of the in vitro experiments. The hatching of the eggs exposed to PZQ at a concentration of 0.1ƒEg/ml for one hour in vitro was inhibited.