Effects of exogenous glucose on survival and infectivity of Schistosoma mansoni cercariae
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Abstract
The effects of exogenous glucose in artificial spring water (ASW) were studiedon the survival and infectivity of Schistosoma mansoni cercariae. The mean percentsurvival of cercariae maintained in 1% glucose in ASW for 36 and 48hr was significantlygreater than that of cercariae maintained identically in ASW. Cercariae maintained inASW with or without glucose for 24hr, fixed in neutral buffered formalin, and stained inOil Red O, showed an accumulation of neutral lipid in the tail. Cercariae maintained asdescribed above and stained in periodic acid-Schiff exhibited depleted glycogen, mainlyfrom the tail. Cercariae maintained in ASW with glucose for 24hr did not resynthesizeglycogen. Cercariae maintained in ASW with glucose for 24hr were as capable of infectingmale FVBN202 mice as were freshly emerged cercariae, and increased the percent of wormrecovery. Exogeneous glucose added to ASW prolonged the survival of S. mansonicercariae and increased infectivity in terms of worm recovery.