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Background  The endemicity of human schistosomiasis has long been established in Ethiopia, and new foci have also been continuously reported.  The objective of this study was to determine the transmission and magnitude of schistosomiasis in Hayk area, northeastern Ethiopia.    Methods  A cross sectional parasitological survey involving 384 school children was conducted for intestinal schistosomiasis between January and March 2010 in two primary schools in Hayk area, northeastern Ethiopia. The stool samples were processed for microscopic examination using Kato-Katz technique. Malacological survey and observation on human water contact activities were also carried out. Snails were checked for schistosome infection by shedding and lab-bred mice were exposed to the cercariae shed from  Biomphalaria pfeifferi en masse . Adult  Schistosoma mansoni  worms were harvested from the mice after 45 days of exposure to the schistosome cercariae.    Results  The overall prevalence and intensity of intestinal schistosomiasis among school children in Hayk Number 1 and Hayk Number 2 Primary Schools was found to be 45% and 161 epg, respectively. The prevalence of infection had relationship with age and sex. Males were more infected than females. Children in the age group 15-19 years had the highest infection rate, followed by 10-14 and 5-9 years age group. Schistosome infection in  Biomphalaria pfeifferi  was 3.2%. Schistosome infection was also established in laboratory-bred mice and adult  Schistosoma mansoni  worms were harvested.    Conclusion  The observed intestinal schistosomiasis with prevalence of 45% among young children, collection of schistosome infected  Biomphalaria pfeifferi,  and the establishment of lab infection in mice showed that transmission of intestinal schistosomiasis is taking place in the area. Preventive chemotherapy with praziquantel should be immediately put in place to reduce morbidity and interrupt transmission of schistosomiasis in the area.

A new focus of schistosomiasis mansoni in Hayk town, northeastern Ethiopia