ABSTRACT
Vampirolepis nana is the most common cestode in humans especially children. Domestic mice and rats can serve as definitive hosts for V. nana. Confusion exists over the species status and host-specificity of this tapeworm. In a previous study done by the same authors it was found that the Egyptian human isolates of V. nana could be used to infect mice for experimental work. Eggs in human feces and in the fecal pellets excreted by mice probably lose their infectivity sooner or later. Such information is very important from the epidemiologic and epizootic points of view. The aim of this work was to study the infectivity of V. nana var. nana eggs isolated from human feces, murine fecal pellets and worm gravid proglottids after storage for different periods of time. According to the results, the transmission potential capacity of the human strain of V. nana by mice can not be ignored. The relative infectivity of the eggs isolated from the murine rectal fecal pellets is higher than that isolated from the worm because some immature eggs are found in the gravid segments. It was clear that storage of eggs had a deteriorating effect and that the egg infectivity was dependent upon storage time. After 2 wk of storage in dechlorinated water some eggs were still viable and infective. Such a group of eggs present a health risk for people living in the wastewater-exposed areas like Egyptian rural areas, or when wastewater is reused for agricultural purposes as in countries with water scarcity
Subject(s)
Humans , Animals, Laboratory , Mice , Hymenolepiasis/transmissionABSTRACT
In this study, rabbits were infected with 30 metacercariae each. Then, they were divided into four categories, each of two groups. One category served as control and the others were treated each with a drug. The first group from each group was treated when worms were still immature, the other group was treated after maturity. The effect of the drugs was monitored by stool examination for eggs, the percentage of egg reduction and worm recovery at autopsy were studied and the percentage of the drug efficacy was calculated. Some eggs were cultured and their embryonation and hatching were traced. The results pointed out that triclabendazole was the best fasciolicide, followed by bithionol. Praziquantel had a negligible effect
Subject(s)
Animals , Bithionol , Praziquantel , Benzimidazoles , Fasciola/drug effects , RabbitsABSTRACT
Prevention of human fascioliasis could depend on clearing the leafy salads from the metacercariae. The present work evaluated the role of some chemicals in detaching and killing this infective stage. It was observed that washing in running water for 10 minutes detached only 50% of the metacercariae. Citric acid in the concentration of [10 ml/L], commercial vinegar [120 ml/L], liquid soap [12 ml/L] and KMnO4 [24 mg/L] detached all metacercariae after 10 minutes exposure. The use of vinegar and KMnO4 was recommended; the former is lethal to other parasites in the vegetables, the second destroyed the metacercariae. Vegetable leaves were not softened and remained fresh