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Near-infrared spectroscopy as a complementary age grading and species identification tool for African malaria vectors.

Sikulu, M., Killeen, G. F., Hugo, L. E., Ryan, P. A., Dowell, K. M., Wirtz, R. A., Moore, S. J. and Dowell, F. E. (2010) Near-infrared spectroscopy as a complementary age grading and species identification tool for African malaria vectors. Parasites & vectors, 3 (49). pp. 1-7. ISSN 1756-3305

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Abstract

ABSTRACT: Near-infrared spectroscopy (NIRS) was recently applied to age-grade and differentiate laboratory reared Anopheles gambiae sensu strico and Anopheles arabiensis sibling species of Anopheles gambiae sensu lato complex. In this study, we report further on the accuracy of this tool for simultaneously estimating the age class and differentiating the morphologically indistinguishable An. gambiae s.s. and An. arabiensis from semi-field releases and wild populations. Nine different ages (1, 3, 5, 7, 9, 11, 12, 14, 16 d) of An. arabiensis and eight different ages (1, 3, 5, 7, 9, 10, 11, 12 d) of An. gambiae s.s. maintained in 250 x 60 x 40 cm cages within a semi-field large-cage system and 105 wild-caught female An. gambiae s.l., were included in this study. NIRS classified female An. arabiensis and An. gambiae s.s. maintained in semi-field cages as <7 d old or >/=7 d old with 89% (n = 377) and 78% (n = 327) accuracy, respectively, and differentiated them with 89% (n = 704) accuracy. Wild caught An. gambiae s.l. were identified with 90% accuracy (n = 105) whereas their predicted ages were consistent with the expected mean chronological ages of the physiological age categories determined by dissections. These findings have importance for monitoring control programmes where reduction in the proportion of older mosquitoes that have the ability to transmit malaria is an important outcome.

Item Type: Article
Keywords: malaria vector, Afirca, Anopheles gambiae, mosquito species
Subjects: Malaria > Vector control
Divisions: Ifakara Health Institute > Biomedical
Depositing User: Mr Joseph Madata
Date Deposited: 30 Jul 2012 09:17
Last Modified: 16 Aug 2012 15:57
URI: http://ihi.eprints.org/id/eprint/109

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