R R M L R Siyambalagoda

Publications (3)3.05 Total impact

• Source

  Available from: Yusuf Ozbel

  Article: Distribution and ecological aspects of sand fly (Diptera: Psychodidae) species in Sri Lanka.

  Yusuf Ozbel, Chizu Sanjoba, Bulent Alten, Masahito Asada, Jerome Depaquit, Yasunobu Matsumoto, Samiye Demir, R R M L R Siyambalagoda, R P V J Rajapakse, Yoshitsugu Matsumoto
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  ABSTRACT: Human indigenous cutaneous leishmaniasis caused by Leishmania donovani complex is endemic in Sri Lanka. We performed an entomological survey to determine the distribution of probable vector species. Sand flies were collected in districts in the dry zone, in the wet zone highlands, and in the wet zone coastal belt of Sri Lanka using CDC light traps, sticky traps and cattle-baited net traps during July, 2005. The survey was reconducted in February, 2006. Overall, 584 sand flies belonging to Phlebotomus (266 specimens, 2 species) and Sergentomyia (318 specimens, 8 species) genera were collected. A total of 266 Phlebotomus was identified as P. argentipes (258/266; 97%) and P. stantoni (8/266; 3%) . The identification studies of Sergentomyia specimens showed that there are at least 8 species in Sri Lanka. Higher number of Phlebotomus sand flies (76/266) were caught in the southern part of the country compared to the other parts probably due to different ecological aspects. P. argentipes were widely distributed throughout the island whereas P. stantoni were collected only in four districts. Since P. argentipes is known to be the vector of L. donovani responsible of visceral leishmaniasis in India, this species may be incriminated as the most possible vector of human cutaneous leishmaniasis in Sri Lanka.
  Journal of Vector Ecology 03/2011; 36 Suppl 1:S77-86. · 0.88 Impact Factor
• Article: Distribution and ecological aspects of sand fly (Diptera: Psychodidae) species in Sri Lanka

  Yusuf Ozbel, Chizu Sanjoba, Bulent Alten, Masahito Asada, Jerome Depaquit, Yasunobu Matsumoto, Samiye Demir, R.R.M.L.R. Siyambalagoda, R.P.V. J. Rajapakse, Yoshitsugu Matsumoto
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  ABSTRACT: Human indigenous cutaneous leishmaniasis caused by Leishmania donovani complex is endemic in Sri Lanka. We performed an entomological survey to determine the distribution of probable vector species. Sand flies were collected in districts in the dry zone, in the wet zone highlands, and in the wet zone coastal belt of Sri Lanka using CDC light traps, sticky traps and cattle-baited net traps during July, 2005. The survey was reconducted in February, 2006. Overall, 584 sand flies belonging to Phlebotomus (266 specimens, 2 species) and Sergentomyia (318 specimens, 8 species) genera were collected. A total of 266 Phlebotomus was identified as P. argentipes (258/266; 97%) and P. stantoni (8/266; 3%) . The identification studies of Sergentomyia specimens showed that there are at least 8 species in Sri Lanka. Higher number of Phlebotomus sand flies (76/266) were caught in the southern part of the country compared to the other parts probably due to different ecological aspects. P. argentipes were widely distributed throughout the island whereas P. stantoni were collected only in four districts. Since P. argentipes is known to be the vector of L. donovani responsible of visceral leishmaniasis in India, this species may be incriminated as the most possible vector of human cutaneous leishmaniasis in Sri Lanka.
  Journal of Vector Ecology. 02/2011; 36(s1):S77 - S86.
• Source

  Available from: Janet Hemingway

  Article: Spatiotemporal distribution of insecticide resistance in Anopheles culicifacies and Anopheles subpictus in Sri Lanka.

  L A Kelly-Hope, A M G M Yapabandara, M B Wickramasinghe, M D B Perera, S H P P Karunaratne, W P Fernando, R R Abeyasinghe, R R M L R Siyambalagoda, P R J Herath, G N L Galappaththy, J Hemingway
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  ABSTRACT: The malaria situation in Sri Lanka worsened during the 1990s with the emergence and spread of resistance to the drugs and insecticides used for control. Chloroquine resistance has increased rapidly over this period, but adverse changes in malaria transmission are more closely associated with insecticide use rather than drug resistance. Insecticide susceptibility tests were routinely carried out in key anopheline vectors across the country for more than a decade. These sentinel data were combined with data collected by other research programmes and used to map the spatial and temporal trends of insecticide resistance in the main vectors, Anopheles culicifacies and A. subpictus, and to examine the relationship between insecticide resistance, changes in national spraying regimens and malaria prevalence. Both species had widespread resistance to malathion, the insecticide of choice in the early 1990s. Both species were initially susceptible to the organophosphate and pyrethroid insecticides used operationally from 1993, but some resistance has now been selected. The levels of malathion and fenitrothion resistance in A. subpictus were higher in some ecological regions than others, which may be related to the distribution of sibling species, agricultural pesticide exposure and/or environmental factors. The study highlights that the emergence and spread of insecticide resistance is a constant threat and that active surveillance systems are vital in identifying key vectors and evidence of resistance.
  Transactions of the Royal Society of Tropical Medicine and Hygiene 11/2005; 99(10):751-61. · 2.16 Impact Factor