Volume 69, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Investigations on intestinal schistosomiasis were carried out in Yoro, a small village located in the transitional zone between forest and savannah, in the Mbam and Inoubou Division of Cameroon. Four human-water contact points were identified in the village and sampled for snails, and the inhabitants underwent parasitologic and clinical surveys to search for signs and symptoms of intestinal schistosomiasis. The results indicated the presence of two freshwater snails, both potential intermediate hosts of sp: and . However, only the former species was incriminated in the transmission of the disease, with the prevalence of snail infection being 10% (1 of 10) and 14.3% (2 of 14), respectively, during surveys 1 (in the dry season) and 2 (in the rainy season). The overall prevalence of eggs in stool samples was 54.4% (98 of 180). The mean ± SD intensity of infection was 100.3 ± 114.7 eggs per gram of stool. Eggs of were not detected during parasitologic examination of stool specimens. In Cameroon, it appears that unlike the distribution of , which usually follows that of , is commonly found where does not exist due to competitive exclusion through introgressive hybridization. Of the 180 people included in the study, 52.3% reported abdominal pain and 37.5% had bloody stools. Splenomegaly and hepatomegaly were noted in 11.7% and 3.9%, respectively, of the subjects examined. Three foci of were previously described in the Mbam and Inoubou Division, including Bafia town, Makenene, and Kinding Djabi villages. With the present focus in Yoro, the Mbam and Inoubou Division appears to be the most important endemic zone of in southern Cameroon.


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  • Received : 22 Apr 2002
  • Accepted : 27 Jan 2003
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