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Bilharzia

Bilharzia

disease caused by worms that parasitise people. Also called schistosomiasis. Three main species of these trematode worms (flukes)--Schistosoma haematobium, s. Japonicum, and s. Mansoni cause disease in humans. Larval forms of the parasite live in freshwater snails. The cercaria (form of the parasite) is liberated from the snail burrow into skin, transforms to the schistosomulum stage, and migrates to the urinary tract (s. Haematobium), liver or intestine (s. Japonicum, s.mansoni) where the adult worms develop. Eggs are shed into the urinary tract or the intestine and hatch to form miracidia (yet another form of the parasite) which then infect snails, completing the life cycle of the parasite. Adult schistosome worms can seriously damage tissue. The name bilharzia comes from that of the shortlived german physician Theodor Bilharz (1825-1862).


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Environmental changes are spreading infectious diseases

... forests and the spread of cities, are promoting conditions for a rise in new and previously suppressed infectious diseases, including malaria and bilharzia, according to the United Nations Environment Programme (UNEP) latest yearbook. Climate change may aggravate the threats of infectious diseases ...

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by yincai
Tue Oct 20, 2009 12:29 pm
 
Forum: Ecology
Topic: Environmental changes are spreading infectious diseases
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