Interactions between Schistosoma haematobium and Schistosoma mansoni in humans in north Cameroon

• Published in: Tropical medicine & international health Vol. 8; no. 12; pp. 1110 - 1117
• Main Authors: Cunin, P., Tchuem Tchuenté, L.‐A., Poste, B., Djibrilla, K., Martin, P. M. V.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 01.12.2003; Blackwell Science
• Subjects: Adolescent; Animals; Biological and medical sciences; Cameroon; Cameroon - epidemiology; Child; Child, Preschool; Diseases caused by trematodes; ectopic eggs; Feces - parasitology; Female; Health Surveys; Helminthic diseases; Humans; Infectious diseases; Male; Medical sciences; Parasite Egg Count; Parasitic diseases; Prevalence; Schistosoma haematobium; Schistosoma haematobium - isolation & purification; Schistosoma mansoni; Schistosoma mansoni - isolation & purification; Schistosomiases; schistosomiasis; Schistosomiasis haematobia - complications; Schistosomiasis haematobia - epidemiology; Schistosomiasis haematobia - parasitology; Schistosomiasis mansoni - complications; Schistosomiasis mansoni - epidemiology; Schistosomiasis mansoni - parasitology; Snails - parasitology; Urine - parasitology; Cameroon; Africa; Human; Schistosoma mansoni; Prevalence; Schistosoma haematobium; Trematode disease; Plathelmintha; Parasitosis; Helminthiasis; Epidemiology; Trematoda; Infection; Schistosomiasis; Helmintha; Tropical medicine; Invertebrata; Public health
• ISSN: 1360-2276; 1365-3156
• DOI: 10.1046/j.1360-2276.2003.01139.x

Summary Objectives  To analyse the relationships between the frequency of ectopic localizations of Schistosoma haematobium and S. mansoni eggs. Methods  Studies were conducted in 11 villages in north Cameroon, around Bessoum, a village where an epidemic of bloody diarrhoea caused by S. mansoni occurred in 1997. Results  The results revealed infection prevalence rates of 70.5% for S. haematobium and 30.8% for S. mansoni. Interestingly, S. mansoni eggs were found in 14.5% of the urine samples and S. haematobium eggs in 3% of the stool samples. These ectopic eliminations of schistosome eggs resulted from sexual interactions between the two species of schistosomes, and from a spill‐over of high infection loads. The clinical study showed that the morbidity was lower in individuals with mixed infections and high loads of S. haematobium than in those with S. mansoni infections only, suggesting a possible lowering effect of S. haematobium infection on S. mansoni morbidity. Discussion  The results obtained in human populations are discussed in relation to the known schistosome interspecific interactions in animal models.