scholarly journals Distribusi Vektor Malaria Anopheles (Diptera: Cullicidae) di Kabupaten Bulukumba, Indonesia

2018 ◽  
Vol 12 (1) ◽  
pp. 1-8
Author(s):  
Andi Tilka Muftiah
Keyword(s):  
Health Centre ◽  
Light Trap ◽  
Abundant Species ◽  
Malaria Vectors ◽  
Mosquito Vector ◽  
Entomological Surveillance ◽  
Anopheles Subpictus ◽  
Anopheles Mosquitoes ◽  
Community Based Programs ◽  
Human Landing

Abstract Anopheles is an eminent mosquito vector responsible for Plasmodium infection in human. By far, 430 anophelines have been identified but only 30-40 species have the potential to transmit malaria. A survey was carried to describe the distribution of anophelines species in seven community health centre (CHC) working areas including Caile, Ujung Loe, Bonto Bahari, Bonto Tiro, Batang, Bonto Bangun and Tanete in Bulukumba District, South Sulawesi. Human Landing Collection, Net Trap, and Light Trap was applied to collect adult anophelines mosquitoes. The Anopheles malaria vectors were observed in all areas. Various anophelines malaria vectors exist in Bulukumba District, including An. subpictus, An. barbirostris, An. hyrcanus, An. vagus, An. indefinitus, An. parangensis and An. kochi. Of which, Anopheles subpictus was the most abundant species and the majority of Anopheles mosquitoes were found in Ujung Loe area. Our study indicates that community-based programs and routine entomological surveillance, especially in high-risk areas, should be implemented to effectively control malaria transmission in Bulukumba District. Abstrak Malaria pada manusia ditularkan oleh nyamuk betina Anopheles yang berperan sebagai vektor yang membawa parasit Plasmodium. Terdapat sekitar 430 spesies Anopheles, 30-40 diantaranya berpotensi untuk menularkan malaria ke manusia. Penelitian ini bertujuan untuk menggambarkan distribusi vektor Anopheles di Kabupaten Bulukumba melalui survei entomologi (observasional) dengan pendekatan deskriptif. Sampel penelitian adalah nyamuk Anopheles di tujuh wilayah kerja puskesmas, yakni Puskesmas Caile, Ujung Loe, Bonto Bahari, Bonto Tiro, Batang, Bonto Bangun dan Tanete. Penangkapan vektor Anopheles dilakukan dengan metode Human Landing Collection (HLC), Net Trap, dan Light Trap. Hasil penelitian menggambarkan distribusi vektor Anopheles yang tersebar di tujuh wilayah kerja puskesmas yakni An. subpictus, An. barbirostris, An. hyrcanus, An. vagus, An. indefinitus, An. parangensis dan An. kochi. Anopheles subpictus merupakan spesies yang paling banyak ditemukan, sedangkan wilayah kerja Puskesmas Ujung Loe merupakan lokasi yang paling banyak ditemukan vektor Anopheles. Variasi vektor Anopheles yang tersebar di wilayah Kabupaten Bulukumba hendaknya mendorong para pengambil kebijakan di tingkat dinas kesehatan dan puskesmas untuk menyusun program pengendalian malaria yang optimal dan sesuai, baik dari segi pemberdayaan masyarakat dan pelaksanaan survei entomologi secara berkala khususnya pada wilayah yang berisiko.

scholarly journals Species diversity and insecticide resistance within the Anopheles hyrcanus group in Ubon Ratchathani Province, Thailand

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Anchana Sumarnrote ◽  
Hans J. Overgaard ◽  
Vincent Corbel ◽  
Kanutcharee Thanispong ◽  
Theeraphap Chareonviriyaphap ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
Control Strategies ◽  
Resistance Mechanism ◽  
Abundant Species ◽  
Malaria Vectors ◽  
Pcr Assay ◽  
Insecticide Susceptibility ◽  
Human Landing ◽  
Early Peak

Abstract Background Members of the Anopheles hyrcanus group have been incriminated as important malaria vectors. This study aims to identify the species and explore the insecticide susceptibility profile within the Anopheles hyrcanus group in Ubon Ratchathani Province, northeastern Thailand where increasing numbers of malaria cases were reported in 2014. Methods Between 2013 and 2015, five rounds of mosquito collections were conducted using human landing and cattle bait techniques during both the rainy and dry seasons. Anopheles mosquitoes were morphologically identified and their insecticide susceptibility status was investigated. Synergist bioassays were carried out with An. hyrcanus (s.l.) due to their resistance to all insecticides. An ITS2-PCR assay was conducted to identify to species the Hyrcanus group specimens. Results Out of 10,361 Anopheles females collected, representing 18 taxa in 2 subgenera, 71.8% were morphologically identified as belonging to the Hyrcanus Group (subgenus Anopheles), followed by An. barbirostris group (7.9%), An. nivipes (6.5%), An. philippinensis (5.9%) and the other 14 Anopheles species. Specimens of the Hyrcanus Group were more prevalent during the rainy season and were found to be highly zoophilic. Anopheles hyrcanus (s.l.) was active throughout the night, with an early peak of activity between 18:00 h and 21:00 h. ITS2-PCR assay conducted on 603 DNA samples from specimens within the Hyrcanus Group showed the presence of five sisters species. Anopheles peditaeniatus was the most abundant species (90.5%, n = 546), followed by An. nitidus (4.5%, n = 27), An. nigerrimus (4.3%, n = 26), An. argyropus (0.5%, n = 3), and An. sinensis (0.2%, n = 1). All An. hyrcanus (s.l.) specimens that were found resistant to insecticides (deltamethrin 0.05%, permethrin 0.75% and DDT 4% and synergist tests) belonged to An. peditaeniatus. The degree of resistance in An. peditaeniatus to each of these three insecticides was approximately 50%. Addition of PBO (Piperonyl butoxide), but not DEF (S.S.S-tributyl phosphotritioate), seemed to restore susceptibility, indicating a potential role of oxidases as a detoxifying enzyme resistance mechanism. Conclusions A better understanding of mosquito diversity related to host preference, biting activity and insecticide resistance status will facilitate the implementation of locally adapted vector control strategies.

scholarly journals Evaluation of mosquito electrocuting traps as a safe alternative to the human landing catch for measuring human exposure to malaria vectors in Burkina Faso

2019 ◽  
Vol 18 (1) ◽  
Author(s):  
Antoine Sanou ◽  
W. Moussa Guelbéogo ◽  
Luca Nelli ◽  
K. Hyacinth Toé ◽  
Soumanaba Zongo ◽  
...  
Keyword(s):  
Species Composition ◽  
Burkina Faso ◽  
Malaria Vector ◽  
Human Exposure ◽  
Infected Mosquito ◽  
Malaria Vectors ◽  
Human Landing Catch ◽  
Mosquito Vector ◽  
Human Landing ◽  
Biting Behaviour

Abstract Background Measuring human exposure to mosquito bites is a crucial component of vector-borne disease surveillance. For malaria vectors, the human landing catch (HLC) remains the gold standard for direct estimation of exposure. This method, however, is controversial since participants risk exposure to potentially infected mosquito bites. Recently an exposure-free mosquito electrocuting trap (MET) was developed to provide a safer alternative to the HLC. Early prototypes of the MET performed well in Tanzania but have yet to be tested in West Africa, where malaria vector species composition, ecology and behaviour are different. The performance of the MET relative to HLC for characterizing mosquito vector population dynamics and biting behaviour in Burkina Faso was evaluated. Methods A longitudinal study was initiated within 12 villages in Burkina Faso in October 2016. Host-seeking mosquitoes were sampled monthly using HLC and MET collections over 14 months. Collections were made at 4 households on each night, with METs deployed inside and outside at 2 houses, and HLC inside and outside at another two. Malaria vector abundance, species composition, sporozoite rate and location of biting (indoor versus outdoor) were recorded. Results In total, 41,800 mosquitoes were collected over 324 sampling nights, with the major malaria vector being Anopheles gambiae sensu lato (s.l.) complex. Overall the MET caught fewer An. gambiae s.l. than the HLC (mean predicted number of 0.78 versus 1.82 indoors, and 1.05 versus 2.04 outdoors). However, MET collections gave a consistent representation of seasonal dynamics in vector populations, species composition, biting behaviour (location and time) and malaria infection rates relative to HLC. As the relative performance of the MET was somewhat higher in outdoor versus indoor settings, this trapping method slightly underestimated the proportion of bites preventable by LLINs compared to the HLC (MET = 82.08%; HLC = 87.19%). Conclusions The MET collected proportionately fewer mosquitoes than the HLC. However, estimates of An. gambiae s.l. density in METs were highly correlated with HLC. Thus, although less sensitive, the MET is a safer alternative than the HLC. Its use is recommended particularly for sampling vectors in outdoor environments where it is most sensitive.

scholarly journals Species Composition and Diversity of Malaria Vector Breeding Habitats in Trincomalee District of Sri Lanka

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Nayana Gunathilaka ◽  
Wimaladharma Abeyewickreme ◽  
Menaka Hapugoda ◽  
Rajitha Wickremasinghe
Keyword(s):  
Sri Lanka ◽  
Larval Habitat ◽  
Malaria Vectors ◽  
Entomological Surveillance ◽  
Anopheles Subpictus ◽  
Control Programs ◽  
Breeding Habitats ◽  
Elimination Programme ◽  
Total Dissolved Solid ◽  
The Relationship

Introduction. Mosquito larval ecology is important in determining larval densities and species assemblage. This in turn influences malaria transmission in an area. Therefore, understanding larval habitat ecology is important in designing malaria control programs.Method. Larval surveys were conducted in 20 localities under five sentinel sites (Padavisiripura, Gomarankadawala, Thoppur, Mollipothana, and Ichchallampaththu) in Trincomalee District, Eastern Province of Sri Lanka, between June 2010 and July 2013. The relationship between seven abiotic variables (temperature, pH, conductivity, Total Dissolved Solid (TDS), turbidity, Dissolved Oxygen (DO), and salinity) was measured.Results. A total of 21,347 anophelines were recorded representing 15 species.Anopheles subpictus24.72% (5,278/21,347) was the predominant species, followed by 24.67% (5,267/21,347) ofAn. nigerrimusand 14.56% (3,109/21,347) ofAn. peditaeniatus. A total of 9,430 breeding habitats under twenty-one categories were identified.An. culcicifacieswas noted to be highest from built wells (20.5%) with high salinity (1102.3 ± 81.8 mg/L), followed by waste water collections (20.2%) having low DO levels (2.85 ± 0.03 mg/L) and high TDS (1,654 ± 140 mg/L).Conclusion. This study opens an avenue to explore new breeding habitats of malaria vectors in the country and reemphasizes the requirement of conducting entomological surveillance to detect potential transmission of malaria in Sri Lanka under the current malaria elimination programme.

scholarly journals Host-seeking behavior and hourly biting rhythm of vectors in malaria endemic district of Arba Minch area, Southwest Ethiopia

2020 ◽  
Author(s):  
Melkam Abiye Zeru ◽  
Simon Shibru ◽  
Fekadu Massebo
Keyword(s):  
Malaria Vector ◽  
Negative Binomial ◽  
Malaria Vectors ◽  
Malaria Vector Control ◽  
Southwest Ethiopia ◽  
Anopheles Mosquitoes ◽  
Host Seeking ◽  
Human Landing ◽  
Seeking Behavior ◽  
The Impact

Abstract Background The early and outdoor biting behaviors of malaria vectors are among the key challenges in malaria control. Hence, understanding the host-seeking behavior and the peak biting time of malaria vectors is important in malaria vector control programs. This study assessed the host-seeking behavior and hourly biting activity of malaria mosquitoes in Chano Mille village in Arba Minch district, southwest Ethiopia. Methods The first trial was done by keeping cattle together with human that collects the entered mosquitoes in tent, while the other was done by keeping cattle outside a 1 m distance from human collector inside a tent. In both trials, mosquito collation was done inside tents baited by cattle and human using human landing catches (HLC) techniques. Four human volunteers’ were recruited and trained to collect mosquitoes in the four tents from 18:00-24:00 for three months. Two tents were selected randomly for human alone and two for cattle baited collections in the first night and then rotated to minimize the variation due to location of tents and collectors skill. The tent trial was done close to the shore of the Lake Abaya to minimize the interference of other animals on mosquito movement. The peak biting hour of malaria vectors was assessed within a Chano village from 18:00-6:00. Mosquito collation was done both indoor and outdoor by HLC. Morphological speciation of Anopheles mosquitoes was done. The sporozoite infectivity status of Anopheles pharoensis was examined using enzyme-linked immuno-sorbent assay technique. The data was analyzed using a Generalized Estimating Equations with a negative binomial distribution. Results An. pharoensis, An. gambiae complex and An. tenebrosus were the three species documented during the trial. Keeping cattle together with human collector inside the tent attracted 42% ( P < 0.001) more An. pharoensis compared to human alone tent. Also, keeping cattle outside near to a tent with human at 1 m distance, attracted the entering An. pharoensis into the tent inside with human by 46% ( P = 0.002) than human in a tent with no cattle outside the same tent. The impact was not significant for An. gambiae complex and An. tenebrosus. Anopheles pharoensis and An. gambiae complex showed early night biting activity with peak biting from 19.00-20:00 which was significant for both An. gambiae complex ( P < 0.001) and An. pharoensis ( P = 0.015). Anopheles gambiae complex was mainly biting humans outdoor in the village. Conclusions Finally, keeping cattle within and close to human dwellings could increase malaria vectors bite exposure particularly to the zoophilic malaria vector An. pharoensis and, hence deployment of cattle far from human residence could be recommended to reduce the human exposure. The outdoor and early hours biting behavior of the An. gambiae complex could be a threat for success of current indoor based interventions and hence, tools could be designed to reduce this threat.

scholarly journals New insights into malaria vector bionomics in Lao PDR: a nationwide entomology survey

2020 ◽  
Author(s):  
Sebastien Marcombe ◽  
Santi Maithaviphet ◽  
Julie Bobichon ◽  
Nothasin Phommavan ◽  
Simone Nambanya ◽  
...  
Keyword(s):  
Molecular Identification ◽  
Sibling Species ◽  
Rural Areas ◽  
Lao Pdr ◽  
Malaria Vectors ◽  
Human Landing Catch ◽  
Morphological Identification ◽  
Anopheles Mosquitoes ◽  
Malaria Burden ◽  
Human Landing

Abstract Background . In Laos, the malaria burden remains high despite a significant reduction of cases during the last decade. In the context of the disease elimination by 2030, a nationwide entomological survey was conducted to better understand the distribution, abundance and behavior of major malaria vectors ( Anopheles spp.) in the country. Methods . Mosquito collections were implemented in ten villages from ten provinces during the rainy and dry seasons of 2014 and 2015 by using human landing catch (HLC) and cow bait collection (CBC) methods. After morphological identification in the field, molecular identification of the sibling species of Anopheles mosquitoes from the Funestus, Leucosphyrus, and Maculatus groups were determined using PCR specific alleles. A screening of Plasmodium falciparum and P. vivax infections in the vectors was carried out by quantitative PCR assays. Results. A total of 14,146 adult mosquitoes representing 25 different Anopheles species were collected and morphologically identified. Molecular identification revealed the presence of 12 sibling species within the main primary vector groups including An. maculatus s.s., An. rampae , An. sawadwongporni , An. pseudowillmori , An. dravidicus , An. minimus s.s., An. aconitus , An. pampanai , An. harrisoni , An. dirus s.s., An. baimaii , An. nemophilous . Anopheles maculatus and An. minimus were predominant during both the dry and rainy seasons, but showed highly zoophilic preferences (Zoophilic index of 98% and 95%, respectively). Overall, 22% of the total malaria vectors were collected between 10:00 PM and 5:00 AM indoors when people are sleeping. Twenty-seven percent of primary and secondary vectors were collected outdoors before 10:00 PM or after 5:00 AM, times when people are usually awake and outdoors. Only two specimens were positive for P. falciparum , one An. aconitus from Phongsaly and one An. minimus from Vientiane Province Conclusions. The results indicate that people living in rural areas in Laos are constantly exposed to malaria vectors throughout the year and specifically outdoors. The use of LLINs/IRS remains important but innovative tools and new strategies are needed to address locally, the early and outdoor malaria transmission. Lack of expertise in general entomological methods may further exacerbate the situation.

scholarly journals Identifikasi Vektor Malaria di Daerah Sekitar PLTU Teluk Sirih Kecamatan Bungus Kota Padang Pada Tahun 2011

2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Rezka Gustya Sari ◽  
Nurhayati Nurhayati ◽  
Rosfita Rasyid
Keyword(s):  
Malaria Vector ◽  
Light Trap ◽  
Anopheles Mosquito ◽  
Anopheles Mosquitoes ◽  
Genus Plasmodium ◽  
Human Landing ◽  
Indoor And Outdoor

AbstrakMalaria adalah penyakit infeksi parasit yang disebabkan oleh protozoa obligat intraselular dari genus Plasmodium yang ditularkan nyamuk Anopheles. Bungus merupakan salah satu kecamatan dengan kasus malaria tinggi di Kota Padang, terdapat 69 kasus malaria pada tahun 2011. Pengendalian vektor malaria dibutuhkan pengetahuan mengenai spesies vector. Tujuan penelitian ini adalah menentukan spesies nyamuk tersangka vektor malaria. Penelitian dilaksanakan dari Oktober sampai November 2011. Nyamuk Anopheles di tangkap di dalam dan di luar ruangan menggunakan light trap dan umpan orang menggunakan aspirator. Penangkapan dilakukan pada malam hari pada jam 18.00 - 06.00 dan pagi hari pada jam 07.00 - 09.00. Semua nyamuk yang berhasil tertangkap diidentifikasi di bawah mikroskop. Bedasarkan penelitian yang telah dilakukan didapatkan nyamuk An.subpictus, An.sundaicus dan An.aconitus dengan persentase (49,5%), (29,4%) dan (14,7%). Hal ini menunjukkan bahwa An.sundaicus, An.subpictus dan An.aconitus memiliki potensi yang besar dalam penularan penyakit malaria.                                 Kata kunci: malaria, vektor malaria AbstractMalaria is a disease caused by intracellular obligate protozoa, genus of plasmodium which is a parasite is carried by Anopheles mosquito. Bungus subdistrict is one of the areas that has high case of malaria in Padang district of Sumatera Barat Province, there were 69 case of malaria. Determination of method of control requires an understanding on the species of mosquito which serves as the vector and its behavior. The objective of this study was to assess fauna and the activity of Anopheles spp as suspected malaria vector. This research had done on October to November 2011. The Anopheles mosquitoes were collected indoor and outdoor by using light trap and human landing collection in the evening starting from 6 p.m - 6 a.m, in the morning from 7 - 9 a.m. All the Moquitoes were  brougt to the laboratory for identifications. The resut showed that An. subpictus (49.5%) An. sundaicus (29.4%) and A. aconitus (14.7%). were the suspected malaria vector that has important role in tranmission of malaria in this area.Keywords: malaria, malaria vektor

Relationship to human biting collections and influence of light and bednet in CDC light-trap catches of West African malaria vectors

1998 ◽  
Vol 88 (5) ◽  
pp. 503-511 ◽  
Author(s):  
C. Costantini ◽  
N.F. Sagnon ◽  
E. Sanogo ◽  
L. Merzagora ◽  
M. Coluzzi
Keyword(s):  
Light Trap ◽  
West African ◽  
Malaria Vectors ◽  
Prototype Model ◽  
Light Traps ◽  
Mosquito Net ◽  
Cdc Light Trap ◽  
Incandescent Bulb ◽  
Human Landing ◽  
Trap Catches

AbstractThe efficiency of miniature CDC light-traps in catching West African malaria vectors was evaluated during two rainy seasons in a village near Ouagadougou, Burkina Faso. Traps were employed both indoors and outdoors using human baits protected by an insecticide-free mosquito-net and different sources of light. Indoors, light from incandescent bulbs increased the catch of Anopheles gambiae s.l. (mainly A. arabiensis Patton and the Mopti chromosomal form of A. gambiae s.s. Giles) and A. funestus Giles c. 2.5 times as compared to traps whose light bulb was removed. Conversely, the difference was not significant when a UV ‘Blacklight-blue’ fluorescent tube was compared to the incandescent bulb. Protecting the bait with a mosquito-net increased the catch c. 3 times for A. gambiae s.l. and c. 3.5 times for A. funestus. A prototype model of double bednet gave intermediate yields. Outdoors, the addition of incandescent bulbs to unlighted traps did not significantly increase the number of vectors caught, but the addition of the mosquito-net to the unprotected human bait did so by c. 1.5–4 times. Thus, the CDC light-trap hung close to a human sleeping under a bednet and fitted with an incandescent bulb, was considered the most practical and efficient in terms of numbers of vectors caught, consequently its indoor efficiency was compared to human landing catches on single collectors and estimated to be 1.08 times and density-independent. Outdoor light-trap catches were either not significantly correlated to biting collections (as for A. gambiae s.l.), or density-dependent in their efficiency (as for A. funestus); thus, they were not considered a reliable means for estimating malaria vector outdoor biting densities in this area. No difference was found in the parous rate of A. gambiae s.l. samples obtained with CDC light-traps and human landing collections.

scholarly journals Anopheles Mosquito Species in Betung Bedarah, Tebo Regency, Jambi Province

2021 ◽  
Vol 8 (1) ◽  
pp. 35
Author(s):  
Maas M Maloha ◽  
Kanti Ratnaningrum
Keyword(s):  
Mosquito Species ◽  
Light Trap ◽  
Anopheles Mosquito ◽  
Breeding Ground ◽  
Tropical Country ◽  
Anopheles Mosquitoes ◽  
Human Landing ◽  
Anopheles Barbirostris ◽  
Collection Methods ◽  
Anopheles Vagus

Background: Indonesia is a tropical country which is a good breeding ground for mosquitoes. Mosquitoes are still one of arthropods that contribute to occurrence of infectious diseases, including malaria, which is a disease that is a health problem in Jambi Province.Objective: To determine types of Anopheles mosquito spesies in Betung Bedarah Tebo, Jambi.Methods: A discriptif study to identifed distribution of mosquitoes in Betung Bedarah, Tebo Regency used human landing collection and resting collection methods. Collection of mosquito samples used an aspirator and light trap. Analysis used tabulation.Results: Of the 64 mosquitoes collected, 25% were Anopheles mosquitoes which consisted of 43.7% Anopheles barbirostris, 25% Anopheles vagus, 18.7% Anopheles aconitus, and 12.6% Anopheles kochi.Conclusion: Most of mosquito species collected at Betung Berdarah Tebo were Anopheles barbirostris.

The Centres for Disease Control Light Trap (CDC LT) and The Human Decoy Trap (HDT) Compared to The Human Landing Catch (HLC) for Measuring Anopheles Biting in Rural Tanzania

2021 ◽  
Author(s):  
Isaac Haggai Namango ◽  
Carly Marshall ◽  
Adam Saddler ◽  
Amanda Ross ◽  
David Kaftan ◽  
...  
Keyword(s):  
Disease Control ◽  
Large Scale ◽  
Geometric Mean ◽  
Light Trap ◽  
Malaria Vectors ◽  
Human Landing Catch ◽  
Mosquito Abundance ◽  
Rural Tanzania ◽  
Human Landing ◽  
Control Light

Abstract BackgroundThe intensity of vector mosquito biting is an important measure for malaria epidemiology and control. The human landing catch (HLC) is an effective entomological surveillance tool, but is labour-intensive, expensive and raises safety issues. The Centres for Disease Control light trap (CDC LT) and the human decoy trap (HDT) are less costly and exposure-free alternatives. This study compared the CDC LT and HDT against the HLC for measuring Anopheles (An.) biting in rural Tanzania and assessed their suitability as HLC proxies.MethodsIndoor mosquito surveys using HLC and CDC LT and outdoor surveys using HLC and HDT were conducted in 2017 and in 2019 in Ulanga, Tanzania in 19 villages, with one trap per house per night. Species composition, sporozoite rates and the numbers of mosquitoes caught by different trap types were compared. Aggregating the data by village and month, the Bland-Altman approach was used to assess agreement. ResultsOverall, 66,807 Anopheles funestus and 14,606 An. arabiensis adult females were caught from 6,013 CDC LT, 339 indoor HLC, 136 HDT and 195 outdoor HLC collections. Overall, the CDC LT caught fewer malaria vectors than indoor HLC: An. arabiensis (Adjusted rate ratio (Adj.RR) =0.35 (95% confidence interval (CI):0.27-0.46)) and An. funestus (Adj.RR=0.63(95%CI:0.51-0.79)). HDT caught fewer malaria vectors than outdoor HLC: An. arabiensis (Adj.RR=0.04(95%CI:0.01-0.14)) and An. funestus (Adj.RR=0.10(95%CI:0.07-0.15)). The bias and variability of the ratios of geometric mean mosquitoes caught by CDC LT and HDT relative to HLC collections for the same village-month were dependent on mosquito densities. The relative efficacies of both CDC LT and HDT declined with mosquito abundance. The variability in the ratios was substantial for low HLC counts and decreased as mosquito abundance increased. CDCLT caught a higher proportion of infected An. arabiensis and An. funestus than HLC, and HDT caught no infected mosquitoes.ConclusionsIf caution is taken in appreciation of its limitations, the CDC LT is suitable for use in routine entomological surveys and may be preferable for measuring sporozoite rates for Afrotropical mosquitoes. Use of HLC is useful to estimate human exposure to mosquitoes for estimating Entomological Inoculation Rate (EIR). The present design of the HDT is not amenable for use to conduct large-scale entomological surveys.

Sign in / Sign up

Export Citation Format

Share Document