The Efficacy of the BG-Sentinel™ CO2Nozzle in Collecting Host-Seeking Mosquitoes in Fairfax County, Virginia

2010 ◽  
Vol 26 (2) ◽  
pp. 226-228 ◽  
Author(s):  
Hina V. Bhalala ◽  
Joshua D. Smith ◽  
Brent A. O'Dea ◽  
Jorge R. Arias
Keyword(s):  
Fairfax County ◽  
Host Seeking ◽  
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scholarly journals Entomological Survey Confirms Changes in Mosquito Composition and Abundance in Senegal and Reveals Discrepancies among Results by Different Host-Seeking Female Traps

Insects ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 692
Author(s):  
El Hadji Malick Ngom ◽  
Chiara Virgillito ◽  
Mattia Manica ◽  
Roberto Rosà ◽  
Verena Pichler ◽  
...  
Keyword(s):  
Temporal Dynamics ◽  
Species Abundance ◽  
Pathogen Transmission ◽  
Malaria Vectors ◽  
Health Issues ◽  
Entomological Survey ◽  
Human Contact ◽  
Host Seeking ◽  
Trapping Performance ◽  
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Mosquitoes-borne diseases are major public health issues particularly in Africa. Vector control interventions and human-made environmental/climatic changes significantly affect the distribution and abundance of vector species. We carried out an entomological survey targeting host-seeking mosquitos in two different ecological contexts—coastal and inland—in Senegal, by CDC-light and BG-sentinel traps. Results show high predominance of Culex quinquefasciatus (90%) and of Anopheles arabiensis within malaria vectors (46%), with mean numbers of females/trap/nights =8 and <1, respectively, reinforcing previous evidence of changes in species composition and abundance, highlighting thus increasing risk of transmission of filariasis and emerging arboviruses in the Senegambia region. From the methodological perspective, results show a higher specificity of BG traps for Cx. quinquefasciatus and of CDC traps for An. gambiae s.l. and highlight that, despite both traps target the host-seeking fraction of the population, they provide different patterns of species abundance, temporal dynamics and host-seeking activity, leading to possible misinterpretation of the species bionomics. This draws attention to the need of taking into account trapping performance, in order to provide realistic quantification of the number of mosquitoes per units of space and time, the crucial parameter for evaluating vector–human contact, and estimating risk of pathogen transmission.

Comparison between the human landing catch (HLC), an exposure-free mosquito-electrocuting trap (MET) and a BG-Sentinel trap (BGS) for evaluation of transfluthrin emanator against Aedes aegypti using choice and no-choice tests in a semi-field system

2021 ◽  
Author(s):  
Mgeni Mohamed Tambwe ◽  
Adam Saddler ◽  
Ummi Abdul Kibondo ◽  
Rajabu Mashauri ◽  
Katharina S. Kreppel ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Protective Efficacy ◽  
Choice Test ◽  
Human Landing Catch ◽  
Host Seeking ◽  
Close Proximity ◽  
Choice Tests ◽  
Human Landing ◽  
Bg Sentinel ◽  
Collection Point

Abstract Background The human landing catch (HLC) measures human exposure to mosquito bites and evaluates the efficacy of vector control tools. However, it may expose volunteers to potentially infected mosquitoes. The mosquito electrocuting trap (MET) and BG-Sentinel traps (BGS) represent alternative, exposure-free methods for sampling host-seeking mosquitoes. This study investigates whether these methods can be effectively used as alternatives to HLC for measuring the efficacy transfluthrin against Aedes aegypti. Methods The protective efficacy (PE) of freestanding passive transfluthrin emanators (FTPEs), measured by HLC, MET and BGS were compared in no-choice and choice tests. The methods were located 2 m from an experimental hut with FTPEs positioned 3 m on either side of them. For the choice experiment, a competitor HLC was included 10 m from the first collection point. One hundred laboratory-reared Ae. aegypti mosquitoes were released and collected for three consecutive hours. Results In the no-choice test, each method measured similar PE; HLC: 66% (95% confidence interval [CI]: 50–82), MET: 55% (95% CI: 48–63) and BGS: 64% (95% CI: 54–73). The proportion of mosquitoes recaptured was consistent between methods (20–24%) in treatment and varied (47–71%) in the control. However, in choice tests, the PE measured by each method varied; HLC: 37% (95% CI: 25–50%), MET: 76% (95% CI: 61–92) and BGS trap: 0% (95% CI: 0–100). Recaptured mosquitoes were no longer consistent between methods in treatment (2–26%) and remained variable in the control (7–42%). FTPE provided 50% PE to the second HLC 10 m away. In the control, the MET and the BGS were less efficacious in collecting mosquitoes in the presence of a second HLC. Conclusions Measurement of the PE in isolation was fairly consistent for HLC, MET and BGS. Because HLC is not advisable, it is reasonable to use MET / BGS as a proxy for HLC for testing VP in areas of active arboviruses endemic areas. The presence of a human host in close proximity invalidated the PE estimates from BGS and METs. Findings also indicated that transfluthrin can protect multiple people in the peridomestic area and that at short-range mosquitoes select humans over the BGS.

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