Field-derived Schistosoma mansoni and Biomphalaria pfeifferi in Kenya: a compatible association characterized by lack of strong local adaptation, and presence of some snails able to persistently produce cercariae for over a year
| Autor: | Gerald M. Mkoji, L. E. Agola, Eric S. Loker, Geoffrey M. Maina, Ibrahim N. Mwangi, Joseph M. Kinuthia, Celestine K Dweni, Si-Ming Zhang, Moses Mwangi, Martin W. Mutuku, Rosebella O. Maranga |
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| Rok vydání: | 2014 |
| Předmět: |
Entomology
Local adaptation 030231 tropical medicine Zoology Schistosomiasis Snail Compatibility 03 medical and health sciences Feces 0302 clinical medicine Biomphalaria pfeifferi biology.animal parasitic diseases medicine Odds Ratio Animals Humans Cercaria Child Super-sursvivor snails 030304 developmental biology 0303 health sciences biology Biomphalaria Ecology Research fungi Intermediate host Parasite transmission Schistosoma mansoni biology.organism_classification medicine.disease Adaptation Physiological Kenya Schistosomiasis mansoni 3. Good health Infectious Diseases Parasitology Sympatric speciation Host-parasite interactions |
| Zdroj: | Parasites & Vectors |
| ISSN: | 1756-3305 |
| Popis: | Background Schistosoma mansoni is widely distributed in sub-Saharan Africa with Biomphalaria pfeifferi being its most widespread and important snail intermediate host. Few studies have examined the compatibility of field-derived B. pfeifferi snails with S. mansoni miracidia derived from human hosts. We investigated compatibility (as defined by shedding of cercariae following exposure to miracidia) of two isolates of S. mansoni from school children from Asao (western Kenya) and Mwea (central Kenya) with B. pfeifferi collected directly from Asao stream or the Mwea rice fields. Methods We exposed snails from both regions to four different doses of miracidia (1, 5, 10 and 25) from sympatric or allopatric S. mansoni, and maintained them in a shaded, screened out-of-doors rearing facility in Kisian, in western Kenya. Both snail survival and the number of snails that became infected were monitored weekly. This was done for 25 weeks post-exposure (PE). Those infected snails which survived beyond this period were monitored until they all died. Results Although overall survival of Mwea snails maintained in western Kenya was generally low, both sympatric and allopatric combinations of parasites and snails exhibited high compatibility (approximately 50% at a dose of one miracidium per snail), with an increase in infection rates as the miracidial dose was increased (P |
| Databáze: | OpenAIRE |
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