Comparative evaluation of four mosquitoes sampling methods in rice irrigation schemes of lower Moshi, northern Tanzania

Kweka, Eliningaya J.; Mahande, Aneth M

doi:10.1186/1475-2875-8-149

Cited by 32 publications

(33 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This observation is consistent with data from several studies comparing the efficacy of HLC with a diverse range of mosquito collection methods [32,33]. Indeed during HLC, mosquitoes are attracted by both visual and chemical stimuli, whereas CDC light traps use only visual stimuli.…”

Section: Discussionsupporting

confidence: 90%

“…However, the fact that HLC was undertaken outdoors while CDC LT was conducted indoors could have overestimated the efficiency of HLC compared with CDC LT. Because of the personal and property related security issues in Douala, household owners did not permit us to conduct indoor HLC; this prompted us to adjust the study design, whereby HLC was conducted exclusively outdoors while CDC LT continued to be placed indoors. The number of species collected fluctuated substantially between the two methods but was in agreement with previous studies that have indicated that the efficiency of a collection method can vary according to the composition of the mosquito species present, mosquito densities, availability of alternative hosts, and city lighting [33-35]. The sampling efficiency of both collection methods was found to be independent of vector abundance.…”

Section: Discussionsupporting

confidence: 87%

See 1 more Smart Citation

High mosquito burden and malaria transmission in a district of the city of Douala, Cameroon

et al. 2012

View full text Add to dashboard Cite

BackgroundRapid demographic growth in Douala city, Cameroon, has resulted in profound ecological and environmental changes. Although demographic changes can affect anopheline mosquito breeding sites, there is a lack of understanding about the epidemiological impact that such changes might have on vector ecology and malaria transmission.MethodsA 12-month entomological study was conducted in a highly populated district of Douala called Ndogpassi. Adult mosquitoes were collected using two methods: 1) human landing catches (HLC); and 2) Centers for Disease Control and Prevention (CDC) light traps; these methods were used twice monthly from January to December 2011. Mosquito genus and species were identified with morphological and molecular diagnostic tools. The sampling efficiency of the CDC light trap and HLC were compared. Anopheles gambiae infection with Plasmodium falciparum was detected using ELISA. Susceptibility to DDT, permethrin, and deltamethrin insecticides were also determined.ResultsA total of 6923 mosquitoes were collected by HLC (5198) and CDC light traps (1725). There was no equivalence in the sampling efficiency between light traps and human landing catches (P > 0.01). With 51% of the total, Culex was the most common, followed by Anopheles (26.14%), Mansonia (22.7%) and Aedes (0.1%). An. gambiae ss (M form) comprised ~98% of the total anophelines collected. An. gambiae had a biting rate of 0.25 to 49.25 bites per human per night, and was the only species found to be infected with P. falciparum. A P. falciparum infection rate of 0.5% was calculated (based on enzyme-linked immunosorbent assays using the circumsporozoite surface protein). The entomological inoculation rate was estimated at 31 infective bites per annum. Insecticide susceptibility tests on An. gambiae females revealed a mortality rate of 33%, 76% and 98% for DDT, permethrin and deltamethrin, respectively. The West African kdr allele (L1014F) was detected in 38 of the 61 An. gambiae analyzed (62.3%).ConclusionsThe present study revealed seasonal malaria transmission in Douala. High levels of An. gambiae were detected along with a high prevalence of insecticide resistance in this vector population. These findings highlight the need to promote use of insecticide-impregnated bed nets in Douala.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 87%

High mosquito burden and malaria transmission in a district of the city of Douala, Cameroon

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Chemoprophylaxis has been shown to be very effective in preventing malaria in non-immune travelers as well as in semi-immune populations living in malaria endemic areas. [9][10][11] Despite many attempts to find a suitable replacement for the HLC, [12][13][14] none have consistently proven to be as sensitive and as versatile as the HLC, and given the risks of malaria infection and illness, the use of the HLC remains controversial. Increasingly, ethical review committees are reluctant to approve studies that include the use of HLCs given the concern about increased risk of disease among collectors.…”

Section: Introductionmentioning

confidence: 99%

Incidence of Malaria among Mosquito Collectors Conducting Human Landing Catches in Western Kenya

Gimnig

Walker

Otieno³

et al. 2013

The American Journal of Tropical Medicine and Hygiene

View full text Add to dashboard Cite

Abstract. The human landing catch (HLC) has long been the gold standard for estimating malaria transmission by mosquitoes, but has come under scrutiny because of ethical concerns of exposing collectors to infectious bites. We estimated the incidence of Plasmodium falciparum malaria infection in a cohort of 152 persons conducting HLCs and compared it with that of 147 non-collectors in western Kenya. Participants were presumptively cleared of malaria with Coartem™ (artemether-lumefantrine) and tested for malaria every 2 weeks for 12 weeks. The HLC collections were conducted four nights per week for six weeks. Collectors were provided chemoprophylaxis with Malarone™ (atovaquoneproguanil) during the six weeks of HLC activities and one week after HLC activities were completed. The incidence of malaria was 96.6% lower in collectors than in non-collectors (hazard ratio = 0.034, P 0.0001). Therefore, with proper prophylaxis, concern about increased risk of malaria among collectors should not be an impediment to conducting HLC studies.

show abstract

“…Numerous studies have used the landing of mosquitoes as proxies for attraction (e.g. Dia et al , 2005; Kweka & Manhande, 2009), but few studies have identified specific cues inducing mosquitoes to land. Oxocarboxylic acids in human sweat were identified as chemical cues associated with landing in An.…”

Section: Introductionmentioning

confidence: 99%

Activation, orientation and landing of female Culex quinquefasciatus in response to carbon dioxide and odour from human feet: 3-D flight analysis in a wind tunnel

Lacey

Cardé

2010

Medical and Veterinary Entomology

View full text Add to dashboard Cite

This study investigated the interaction between carbon dioxide (CO(2) ) and human foot odour on activation, upwind orientation and landing of host-seeking female Culex quinquefasciatus (Say) (Diptera: Culicidae) in a wind tunnel. More mosquitoes landed on warmed glass beads coated with foot odour than on clean beads; adding a plume of 4% CO(2) did not influence the proportion of mosquitoes landing. A second experiment used 3-dimensional video tracking to assess flight performance. Activation was more rapid with CO(2) and with CO(2) + foot odour than with clean air or with foot odour alone. Upwind flights were fastest with CO(2) and with clean air, and slowest with foot odour; the CO(2) + foot odour treatment overlapped the previous three treatments in significance. Flight headings tended more towards due upwind with CO(2) and with clean air than with CO(2) + foot odour or with foot odour alone. In both experiments, many mosquitoes flew upwind in clean air. There was little evidence of females changing course upon entering or exiting the CO(2) plume or reacting to foot odour during flight.

show abstract

Comparative evaluation of four mosquitoes sampling methods in rice irrigation schemes of lower Moshi, northern Tanzania

Cited by 32 publications

References 17 publications

High mosquito burden and malaria transmission in a district of the city of Douala, Cameroon

High mosquito burden and malaria transmission in a district of the city of Douala, Cameroon

Incidence of Malaria among Mosquito Collectors Conducting Human Landing Catches in Western Kenya

Activation, orientation and landing of female Culex quinquefasciatus in response to carbon dioxide and odour from human feet: 3-D flight analysis in a wind tunnel

Contact Info

Product

Resources

About