Publication: Evaluation of CDC light traps for mosquito surveillance in a malaria endemic area on the Thai-Myanmar border
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2015
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eng
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Mahidol University
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BioMed Central
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Parasites & Vectors. Vol.8, (2015), 636
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Patchara Sriwichai, Stephan Karl, Yudthana Samung, Suchada Sumruayphol, Kirakorn Kiattibutr, Anon Payakkapol, Ivo Mueller, Guiyun Yan, Liwang Cui, Jetsumon Sattabongkot Evaluation of CDC light traps for mosquito surveillance in a malaria endemic area on the Thai-Myanmar border. Parasites & Vectors. Vol.8, (2015), 636. doi:10.1186/s13071-015-1225-3 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/3085
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Evaluation of CDC light traps for mosquito surveillance in a malaria endemic area on the Thai-Myanmar border
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Background: Centers for Disease Control and Prevention miniature light traps (CDC-LT) baited with CO2 are a
routine tool for adult mosquito sampling used in entomological surveys, and for monitoring and surveillance of
disease vectors. The present study was aimed at evaluating the performance of baited and unbaited CDC-LT for
indoor and outdoor trapping of endemic mosquito species in northwestern Thailand.
Methods: CDC-LT (n = 112) with and without dry ice baits were set both indoors and outdoors in 88 selected
houses for stretches of 5 consecutive nights per month in 7 villages in Tha Song Yang district, Tak province
between January 2011 and March 2013. Individual traps were repeatedly placed in the same location for a median
of 6 (range 1–10) times. Mosquitoes were identified by morphological characteristics and classified into blood-fed,
empty, male/female and gravid. Absolute mosquito numbers were converted to capture rates (i.e., mosquitoes per
trap and year). Capture rates were compared using multilevel negative binomial regression to account for multiple
trap placements and adjust for regional and seasonal differences.
Results: A total of 6,668 mosquitoes from 9 genera were collected from 576 individual CDC-LT placements. Culex was
the predominant captured genus (46 %), followed by anopheline mosquitoes (45 %). Overall, CO2 baited traps captured
significantly more Culex (especially Culex vishnui Theobald) and Anopheles mosquitoes per unit time (adjusted capture
rate ratio (aCRR) 1.64 and 1.38, respectively). Armigeres spp. mosquitoes were trapped in outdoor traps with significantly
higher frequency (aCRR: 1.50), whereas Aedes albopictus (Skuse) had a tendency to be trapped more frequently indoors
(aCRR: 1.89, p = 0.07). Furthermore, capture rate ratios between CO2 baited and non-baited CDC-LT were significantly
influenced by seasonality and indoor vs. outdoor trap placement.
Conclusion: The present study shows that CDC-LT with CO2 baiting capture significantly more Culex and Anopheles
mosquitoes, some of which (e.g., Cx. vishnui, Cx. quinquefasciatus Say, An. minimus s.l. Theobald, An. maculatus s.l.
Theobald) represent important disease vectors in Thailand. This study also shows significant differences
in the capture efficiency of CDC-LT when placed indoors or outdoors and in different seasons. Our study thus provides
important guidelines for more targeted future vector trapping studies on the Thai-Myanmar border, which is an
important cross-border malaria transmission region in Thailand.