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Tanzania Journal of Health Research
Health User's Trust Fund (HRUTF)
ISSN: 1821-6404
Vol. 13, No. 1, 2011, pp. 68-78
Bioline Code: th11009
Full paper language: English
Document type: Research Article
Document available free of charge

Tanzania Journal of Health Research, Vol. 13, No. 1, 2011, pp. 68-78

 en Transmission intensity and malaria vector population structure in Magugu, Babati District in northern Tanzania
Mwanziva, Charles E.; Kitau, Jovin; Tungu, Patrick K.; Mweya, Clement N.; Mkali, Humphrey; Ndege, Chacha M.; Sanga, Alex; Mtabho, Charles; Lukwaro, Charles; Azizi, Salum; Myamba, Joseph; Chilongola, Jaffu; Magesa, Stephen M.; Shekalaghe, Seif & Mosha, Franklin W.

Abstract

A 1-year longitudinal study was conducted in Magugu in Babati district, northern Tanzania to determine malaria vector population structure and malaria transmission indices. Mosquitoes were sampled using the Centre for Disease Control (CDC) light traps. A total of 110,357 adult female mosquitoes were collected. Anopheles gambiae check for this species in other resources s.l. accounted 25% of the total female mosquito collected. Relatively fewer An. funestus were collected. Other mosquito species collected were An. pharoensis, An. coustani, An. maculipalpis, An. marshallii, Culex quinquefasciatus check for this species in other resources , Cx unnivittatus, Mansonia uniformis check for this species in other resources and Ma. africana. An analysis by Polymerase Chain Reaction revealed that An. arabiensis was the only member of the An. gambiae complex in the collected samples. The number of mosquito collected correlated with the increasing mean rainfall. Blood meal analysis showed a higher human enzymatic reaction among An. gambiae s.l. (63.5%) followed by An. funestus (42.9%). Bovine enzymatic reaction was higher among An. coustani (73.7%) followed by the An. pharoensis (66.7%). The Enzyme Linked Immunosorbent Assay (ELISA) was used to detect Plasmodium falciparum check for this species in other resources circumsporozoites proteins in 10,000 female Anopheles check for this species in other resources mosquitoes. Only two An. arabiensis were found to be infected. The entomological inoculation rate (EIR) was estimated at 0.51 infectious bites per person per year. This EIR was considered to be relatively low, indicating that malaria transmission in this area is low. Variability in mosquito blood meal shows availability of variety of preferred blood meal choices and impact of other factors inhibiting mosquito-human host contact.The study has provided information considered useful in the mapping of the vector distribution and population structure in the country. Such information is considered to be among the essential tools for planning malaria control interventions.

Keywords
Anopheles arabiensis, malaria, transmission, vector abundance, Tanzania

 
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