Your search found 7 records
1 Fonseka, K. T.; Amerasinghe, F. P.; Konradsen, F.; Amerasinghe, P. H. 1995. Abundance of potential mosquito vectors of Japanese encephalitis in a dry zone village. Paper presented at the Annual Research Sessions, University of Peradeniya, Faculty of Science, 1995. [Abstract only]. 1p.
Public health ; Encephalitis ; Disease vectors ; Waterborne diseases ; Villages / Sri Lanka / Anuradhapura / Meegaswewa
(Location: IWMI HQ Call no: IIMI 631.7.5 G744 FON Record No: H017894)
2 Konradsen, F.; Van der Hoek, W.; Amerasinghe, F. P.; Amerasinghe, P. H.; Fonseka, K. T.. 1995. A knowledge, attitudes, beliefs and practices survey of Malaria in the Huruluwewa watershed, Anuradhapura District. Proceedings of the SLAAS, 1995. (Paper presented at the Fifty First Annual Sessions of the Sri Lanka Association for the Advancement of Science, Sri Lanka, November 1995) 3p.
(Location: IWMI-HQ Call no: IIMI 631.7.5 G744 KON Record No: H018355)
3 Amerasinghe, F. P.; Konradsen, F.; Fonseka, K. T.; Amerasinghe, P. H. 1997. Anopheline (Dipters: Culicidae) breeding in a traditional tank-based village ecosystem in north central Sri Lanka. Journal of Medical Entomology, 34(3):290-297.
Environment ; Malaria ; Surface water ; Watersheds ; Waterborne diseases / Sri Lanka / Huruluwewa / Mahameegaswewa
(Location: IWMI HQ Call no: IIMI 631.7.5 G744 AME Record No: H09224)
A 13-mo survey of immature anopheline mosquitoes breeding in surface water habitats was done at Mahameegaswewa village within the Huruluwewa watershed in north central Sri Lanka as part of a multidisciplinary study on malaria epidemiology. The watershed is representative of the ancient small tank-based irrigation network that still forms an important component of the rice production system in the low elevation dry zone. In total, 3,818 immatures representing 12 species were obtained from 2,940 samples taken from 5 larval habitats within the village ecosystem. Anopheles varuna Iyengar and An. culicifacies Giles were the most abundant species collected. Peak abundance in both species occurred in August-October. Anopheles barbirostris Van der Wulp and An. peditaeniatus Leicester also were abundant, but neither these nor the other anophelines attained comparable abundance to An. varuna and An. culicifacies. A clear progression in breeding habitat use from stream bed to tank bed and drainage area pools was seen in An. culicifacies during the premonsoon period. Environmental management measures to reduce or modify these habitats could potentially decrease malaria transmission.
4 Konradsen, F.; van der Hoek, W.; Amerasinghe, P. H.; Fonseka, K. T.. 1997. Household responses to malaria and their costs: a study from rural Sri Lanka. Transactions of the Royal Society of Tropical Medicine and Hygiene, 91:127-130.
Households ; Malaria ; Waterborne diseases ; Expenditure ; Irrigation ; Health / Sri Lanka / Asirigama / Eppawela / Mahameegaswewa / Namalapura / Siyambaladamana
(Location: IWMI-HQ Call no: IWMI 631.7.5 G744 KON Record No: H09225)
5 Amerasinghe, F. P.; Konradsen, F.; Amerasinghe, P. H.; van der Hoek, W.; Fonseka, K. T.; Perera, D. 1998. Malaria vectors and transmission dynamics in a "purana" village ecosystem. [Abstract only]. In Careem, M. A.; Mendis, B. R. R. N.; Nelson, M. D. (Eds.). Proceedings and abstracts of the Annual Research Sessions, University of Peradeniya, Sri Lanka, 7 November 1998. pp.22.
Malaria ; Waterborne diseases ; Disease vectors ; Public health ; Villages ; Watersheds / Sri Lanka / Mahameegaswewa / Huruluwewa
(Location: IWMI-HQ Call no: IWMI 631.7.5 G744 AME Record No: H023817)
6 Amerasinghe, P. H.; Amerasinghe, F. P.; Konradsen, F.; Fonseka, K. T.; Wirtz, R. A. 1999. Malaria vectors in a traditional dry zone village in Sri Lanka. American Journal of Tropical Medicine and Hygiene, 60(3):421-429.
Malaria ; Disease vectors ; Waterborne diseases ; Public health / Sri Lanka / Mahameegaswewa / Huruluwewa
(Location: IWMI-HQ Call no: IWMI 616.9362 G744 AME Record No: H024197)
Malaria transmission by anopheline mosquitoes was studied in a traditional tank-irrigation-based rice-producing village in the malaria-endemic low country dry zone of northcentral Sri Lanka during the period August 1994-February 1997. Adult mosquitoes were collected from human and bovid bait catches, bovid-baited trap huts, indoor catches, and pit traps. Mosquito head-thoraces were tested for the presence of Plasmodium falciparum and P. vivax, and blood-engorged abdomens for the presence of human blood by ELISAs. House surveys were done at two-day intervals to record cases of blood film-confirmed malaria among the villagers. A total of 7,823 female anophelines representing 14 species were collected. Trends in anopheline abundance were significantly correlated with rainfall of the preceding month in An. annularis, An. barbirostris, An. subpictus, An. vagus, and An. varuna, but were not significant in An. culicifacies and An. peditaeniatus. Malaria parasite infections were seen in seven mosquito species, with 75% of the positive mosquitoes containing P. falciparum and 25% P. vivax. Polymorph PV247 was recorded from a vector (i.e., An. varuna) for the first time in Sri Lanka. Computations of mean number of infective vector (MIV) rates using abundance, circumsporozoite (CS) protein rate, and human blood index (HBI) showed the highest rate in An. culicifacies. A malaria outbreak occurred from October 1994 to January 1995 in which 45.5% of village residents experienced at least a single disease episode. Thereafter, malaria incidence remained low. Anopheles culicifacies abundance lagged by one month correlated positively with monthly malaria incidence during the outbreak period, and although this species ranked fifth in terms of abundance, infection was associated with a high MIV rate due to a high CS protein rate and HBI. Abundance trends in other species did not correlate significantly with malaria. It was concluded that An. culicifacies was epidemiologically the most important vector in the study area.
7 Amerasinghe, F. P.; Konradsen, F.; van der Hoek, W.; Amerasinghe, P. H.; Gunawardena, J. P. W.; Fonseka, K. T.; Jayasinghe, G. 2001. Small irrigation tanks as a source of malaria mosquito vectors: a study in north-central Sri Lanka. Colombo, Sri Lanka: International Water Management Institute (IWMI). v, 28p. (IWMI Research Report 057) [doi: https://doi.org/10.3910/2009.062]
Watersheds ; Tank irrigation ; Rehabilitation ; Malaria ; Waterborne diseases ; Disease vectors / Sri Lanka / Yan Oya
(Location: IWMI-HQ Call no: IWMI 631.7.5 G744 AME Record No: H029424)
(1.28MB)
Thousands of small irrigation reservoirs (tanks) exist in rice ecosystems in malarious regions of south Asia. The potential of these tanks to generate malaria-transmitting mosquitoes has not been adequately evaluated. Through a study of nine small irrigation tanks in north-central Sri Lanka, this report provides an assessment of the capacity of tanks to generate malaria and nuisance mosquitoes, factors that contribute to mosquito generation, and measures that could ameliorate the problem.
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