scholarly journals Variations in salinity tolerance of malaria vectors of the Anopheles subpictus complex in Sri Lanka and the implications for malaria transmission

2011 ◽  
Vol 4 (1) ◽  
Author(s):  
Sinnathamby N Surendran ◽  
Pavillupillai J Jude ◽  
Ranjan Ramasamy
Keyword(s):  
Sri Lanka ◽  
Malaria Transmission ◽  
Salinity Tolerance ◽  
Malaria Vectors ◽  
Anopheles Subpictus

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.

Malaria Transmission by Anopheles subpictus (Diptera: Culicidae) in a New Irrigation Project in Sri Lanka

1992 ◽  
Vol 29 (4) ◽  
pp. 577-581 ◽  
Author(s):  
P. H. Amerasinghe ◽  
F. P. Amerasinghe ◽  
R. A. Wirtz ◽  
N. G. Indrajith ◽  
W. Somapala ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Malaria Transmission ◽  
Anopheles Subpictus ◽  
Irrigation Project

scholarly journals Keanekaragaman Anopheles dalam Ekosistem Hutan dan Resiko Terjadinya Penularan Malaria di Beberapa Provinsi di Indonesia

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Riyani Setiyaningsih ◽  
Ary Oksari Yanti S ◽  
Lasmiati Lasmiati ◽  
Mujiyono Mujiyono ◽  
Mega Tyas Prihatin ◽  
...  
Keyword(s):  
Malaria Transmission ◽  
Forest Ecosystems ◽  
Light Trap ◽  
Malaria Vectors ◽  
Enzyme Linked Immunosorbent Assay ◽  
Vector Species ◽  
Anopheles Subpictus ◽  
Central Java ◽  
Central Sulawesi ◽  
Anopheles Vagus

Abstract Forests are ecosystems that can support the existence of malaria vectors. The discovery of vector species in the forest environment will increase malaria transmission in the forest and its surroundings. The provinces of South Sumatra, Central Java, Central Sulawesi, and Papua are some of the provinces in Indonesia that still have forest ecosystems. The aim of the study was to know the diversity of Anopheles species and risk of malaria transmission in forest ecosystems in the provinces of South Sumatra, Central Java, Central Sulawesi, and Papua The sampling of mosquitoes was carried out by using the method of human landing collection, animal bited trap, around cattle collection, resting morning and light trap. Larva surveys are carried out in mosquito breeding place. Detection of plasmodium was done by Polymerase Chain Reaction (PCR) while blood feed analysis was carried out with a blood feed test using the Enzyme-linked immunosorbent assay (ELISA) method. Malaria vector species found in forest ecosystems in Central Java are Anopheles maculatus, Anopheles aconitus, Anopheles vagus, Anopheles balabacensis, and Anopheles subpictus. Malaria vector species in the forest ecosystem in South Sumatra are Anopheles nigerimus and Anopheles maculatus. Anopheles malaria vectors in forest environments in Central Sulawesi are Anopheles flavirostris, Anopheles barbirostris, Anopheles ludlowae, and Anopheles vagus. Anopheles malaria vectors in forest ecosystems in Papua are Anopheles farauti, Anopheles koliensis, Anopheles punctulatus, and Anopheles brancofti. Forest presence is at risk of malaria transmission in the provinces of Central Java, South Sumatra, South Sulawesi and Papua Abstrak Hutan merupakan ekosistem yang dapat mendukung keberadaan vektor malaria. Ditemukannya spesies vektor di lingkungan hutan akan meningkatkan penularan malaria di hutan dan sekitarnya. Provinsi Sumatera Selatan, Jawa Tengah, Sulawesi Tengah, dan Papua merupakan beberapa Provinsi di Indonesia yang masih memiliki ekosistem hutan. Tujuan penelitian adalah mengetahui keanekaragaman spesies Anopheles dan risiko penularan malaria pada ekosistem hutan di Provinsi Sumatera Selatan, Jawa Tengah, Sulawesi Tengah, dan Papua. Pengambilan sampel nyamuk dilakukan dengan menggunakan metode human landing collection, animal bited trap, around cattle collection, resting morning dan light trap. Deteksi plasmodium dilakukan dengan Polymerase Chain Reaction (PCR) sedangan analisa pakan darah dilakukan dengan uji pakan darah metode Enzyme- linked immunosorbent assay (ELISA). Survei jentik dilakukan di tempat-tempat perkembangbiakan nyamuk. Spesies vektor malaria yang ditemukan di ekosistem hutan di Jawa Tengah adalah Anopheles maculatus, Anopheles aconitus, Anopheles vagus, Anopheles balabacensis, dan Anopheles subpictus. Spesies vektor malaria di ekosistem hutan di Sumatera Selatan adalah Anopheles nigerimus dan An. maculatus. Anopheles vektor malaria di lingkungan hutan di Sulawesi Tengah adalah Anopheles flavirostris, Anopheles barbirostris, Anopheles ludlowae dan An. vagus. Anopheles vektor malaria pada ekosistem hutan di Papua adalah Anopheles farauti, Anopheles koliensis, Anopheles punctulatus, dan Anopheles brancofti. Keberadaan hutan berisiko terjadinya penularan malaria di Provinsi Jawa Tengah, Sumatera Selatan, Sulawesi Selatan, dan Papua.

scholarly journals Entomological Investigations on Malaria Vectors in Some War-Torn Areas in the Trincomalee District of Sri Lanka after Settlement of 30-Year Civil Disturbance

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Nayana Gunathilaka ◽  
Menaka Hapugoda ◽  
Wimaladharma Abeyewickreme ◽  
Rajitha Wickremasinghe
Keyword(s):  
Sri Lanka ◽  
Malaria Elimination ◽  
Sampling Methods ◽  
Climatic Factors ◽  
Malaria Vectors ◽  
Polluted Water ◽  
Eastern Province ◽  
Anopheles Subpictus ◽  
Monthly Basis ◽  
Predominant Species

Background. Malaria was an endemic problem in Trincomalee District, Eastern Province of Sri Lanka. Very few recent data concerning Anopheles are available which transmit malaria. Therefore, the aim of this study is to identify various Anopheles species and the dynamics of anophelines including malaria vectors in Trincomalee District for effective vector control under the current malaria elimination program embarked in the country. Method. Entomological surveys were conducted on a monthly basis, using five entomological techniques, namely, indoor hand collection (HC), window trap collection (WTC), cattle-baited net collection (CBNC), and cattle-baited hut collection (CBHC) from June 2010 to June 2012 in 32 study areas under five entomological sentinel sites. Results. Seventeen anopheline species were encountered, of which Anopheles subpictus was the predominant species in all sampling methods. It is noted that A. culicifacies and A. subpictus have adapted to breed in polluted water in urban settings which may cause serious implications on the epidemiology of malaria in the country. Conclusions. It is important to determine the abundance, biology, distribution, and relationship with climatic factors of main and secondary malaria vectors in Sri Lanka in order to initiate evidence based controlling programs under the current malaria elimination program in Sri Lanka.

scholarly journals Spatial heterogeneity of malaria vectors and malaria transmission risk estimated using odour-baited mosquito traps

2014 ◽  
Vol 13 (S1) ◽  
Author(s):  
Alexandra Hiscox ◽  
Tobias Homan ◽  
Corné Vreugdenhil ◽  
Bruno Otieno ◽  
Anthony Kibet ◽  
...  
Keyword(s):  
Spatial Heterogeneity ◽  
Malaria Transmission ◽  
Transmission Risk ◽  
Malaria Vectors

scholarly journals Optimising systemic insecticide use to improve malaria control

2019 ◽  
Vol 4 (6) ◽  
pp. e001776 ◽  
Author(s):  
Hannah R Meredith ◽  
Luis Furuya-Kanamori ◽  
Laith Yakob
Keyword(s):  
Vector Control ◽  
Malaria Transmission ◽  
Drug Administration ◽  
Mass Drug Administration ◽  
Companion Animals ◽  
Malaria Vectors ◽  
Systemic Insecticide ◽  
Blood Concentrations ◽  
Systemic Insecticides ◽  
The Impact

BackgroundLong-lasting insecticidal nets and indoor residual sprays have significantly reduced the burden of malaria. However, several hurdles remain before elimination can be achieved: mosquito vectors have developed resistance to public health insecticides, including pyrethroids, and have altered their biting behaviour to avoid these indoor control tools. Systemic insecticides, drugs applied directly to blood hosts to kill mosquitoes that take a blood meal, offer a promising vector control option. To date, most studies focus on repurposing ivermectin, a drug used extensively to treat river blindness. There is concern that overdependence on a single drug will inevitably repeat past experiences with the rapid spread of pyrethroid resistance in malaria vectors. Diversifying the arsenal of systemic insecticides used for mass drug administration would improve this strategy’s sustainability.MethodsHere, a review was conducted to identify systemic insecticide candidates and consolidate their pharmacokinetic/pharmacodynamic properties. The impact of alternative integrated vector control options and different dosing regimens on malaria transmission reduction are illustrated through mathematical model simulation.ResultsThe review identified drugs from four classes commonly used in livestock and companion animals: avermectins, milbemycins, isoxazolines and spinosyns. Simulations predicted that isoxazolines and spinosyns are promising candidates for mass drug administration, as they were predicted to need less frequent application than avermectins and milbemycins to maintain mosquitocidal blood concentrations.ConclusionsThese findings will provide a guide for investigating and applying different systemic insecticides to achieve more effective and sustainable control of malaria transmission.

scholarly journals A Comprehensive Analysis on Abundance, Distribution, and Bionomics of Potential Malaria Vectors in Mannar District of Sri Lanka

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Nayana Gunathilaka ◽  
Menaka Hapugoda ◽  
Rajitha Wickremasinghe ◽  
Wimaladharma Abeyewickreme
Keyword(s):  
Waste Water ◽  
Sri Lanka ◽  
Current Knowledge ◽  
Breeding Habitat ◽  
Control Measures ◽  
Malaria Vectors ◽  
Detailed Knowledge ◽  
Lagoon Water ◽  
Breeding Habitats ◽  
The Mean

Background. A detailed knowledge of the distribution of the malaria vectors in Mannar district of Sri Lanka has not been studied after 1927. Past records indicated the presence of only seven species of anophelines, namely, An. culicifacies, An. subpictus, An. barbirostris, An. peditaeniatus, An. nigerrimus, An. Jamesii, and An. maculatus. There have been many changes in terms of distribution of Anopheles in the district over time. Methods. Entomological surveillance was conducted on a monthly basis, comprising indoor hand collection, window trap collection, cattle-baited net collection, cattle-baited hut collection, and larval survey from June 2010 to June 2012 in 12 study areas under three entomological sentinel sites. The relationship between seven abiotic variables of the breeding habitats was measured. Pearson’s correlation coefficients were used to determine the associations between climatic variables and anopheline densities. Results. A total of 74,181 mosquitoes belonging to 14 Anopheles species were recorded. An. subpictus was the most predominant species from all techniques representing 92% (n=68,268) of the total anopheline collection. However, Anopheles culicifacies was not recorded from any site during the study period. Larval surveys identified 12 breeding habitat categories including waste water collections, lagoon water collections, and drains which were not recorded as breeding habitats by previous studies. The mean dissolved oxygen level of waste water collections was 3.45±0.15 mg/l. The mean salinity and conductivity of lagoon water collections were 21105±1344 mg/l and 34734±1974 μs/cm, respectively. Conclusion. The present study provides the updated knowledge on anopheline distribution and vector bionomics. Therefore, documentation of the current knowledge would be useful for learners and health authorities to design appropriate vector control measures in the prevention of reintroduction of malaria.

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