AI Article Synopsis
- Large-scale agro-industries in malaria-endemic areas, like southern forested Cameroon, can significantly affect malaria transmission patterns through environmental changes.
- A study conducted during the rainy and dry seasons collected a total of 1,187 Anopheles mosquitoes, identifying 66.8% as the M molecular form of An. gambiae, indicating it is the primary malaria vector in both seasons.
- Results showed that malaria transmission was more intense in the dry season than in the rainy season, suggesting that eco-geographical factors due to agro-industrial activities may be altering vector behavior and the dynamics of malaria spread, highlighting the need for tailored control strategies.
Article Abstract
Background: Development of large scale agro-industries are subject to serious environmental modifications. In malaria endemic areas this would greatly impact on the transmission paradigm. Two cross-sectional entomological surveys to characterize the Anopheles fauna and their entomological inoculation rates were conducted during May 2010 (peak rainy season) and December 2010 (peak dry season) in the intense rubber cultivated area of Niete in southern forested Cameroon.
Methods: Mosquitoes were sampled by night collections on human volunteers, identified morphologically and members of the Anopheles gambiae complex further identified to species and molecular form. Parity status was determined following the dissection of the ovaries. Plasmodium falciparum circumsporozoite antigen indices were estimated after the identification of CS antigen by ELISA and the average entomological inoculation rates determined.
Results: A total of 1187 Anopheles was collected, 419 (35.3%) in the rainy season and 768 (64.7%) in the dry season. Species found were the M molecular form of An. gambiae s.s (66.8%), An. ziemanni (28.3%), An. paludis (4.7%), An. smithii (0.2%). An. gambiae M-form was the principal species in the dry (56.2%) and wet (86.2%) seasons. Average overall entomological inoculation rate for the malaria vectors varied between the dry season (1.09 ib/p/n) and the rainy season (2.30 ib/p/n).
Conclusions: Malaria transmission in Niete occurs both in the dry and rainy season with the intensities peaking in the dry season. This is unlike previous studies in other areas of southern forested Cameroon where transmission generally peaks in the rainy season. Environmental modifications due to agro-industrial activities might have influenced vector distribution and the dynamics of malaria transmission in this area. This necessitates the possible implementation of control strategies that are related to the eco-geography of the area.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3453502 | PMC |
| http://dx.doi.org/10.1186/1756-3305-5-197 | DOI Listing |
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