Browsing by Author "Nadeeka, P.V.J."

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Dengue risk based on sociocultural/socioeconomic geographic factors in Kelaniya MOH area
(Research Symposium 2009 - Faculty of Graduate Studies, University of Kelaniya, 2009) Nadeeka, P.V.J.; Amarasinghe, L.D.; Gunathilaka, P.A.D.H.N.; Madushani, I.L.D.
THIS STUDY INVOLVES GEOGRAPHIC, SOCIOCULTURAL AND SOCIOECONOMIC ANALYSIS CONDUCTED FOR THE YEAR 2008 DENGUE FEVER OUTBREAKS IN KELANIYA MEDICAL OFFICER OF HEALTH (MOH) AREA. LOCATIONS OF THE RESIDENCE OF THE 120 DENGUE CASES REPORTED AT KELANIYA MOH OFFICE WERE OBTAINED USING GPS. A STRUCTURED QUESTIONNAIRE THAT INCLUDED 16 OF PRIMARY DATA WAS GIVEN TO EACH PATIENT HOUSEHOLD AFTER VISITING INDIVIDUAL OF THEM AT RESIDENCE. GEOGRAPHIC ATTRIBUTES RELATED TO DENGUE INCIDENCE WERE RECORDED CONCURRENTLY. PRIMARY DATA INCLUDED FAMILY DETAILS, AGE AND GENDER OF THE FAMILY MEMBERS, LIVING CONDITIONS, AWARENESS AND KNOWLEDGE ABOUT DENGUE, HEALTH CARE, HUMAN DWELLINGS, OCCUPATIONAL STATUS, MOSQUITO PROTECTION PRACTICES, ACCESSIBILITY BY ROAD, SANITATION PRACTICES, WASTE DISPOSAL MANAGEMENT AND FREQUENCY, CULTURAL PRACTICES REGARDING STORAGE OF WATER CONTAINERS, VEGETATION COVER AROUND THE HOUSES, AND INDOOR /OUTDOOR AEDES MOSQUITO BREEDING PLACES. MOSQUITO LARVAE COLLECTED FROM BOTH INDOOR AND OUTDOOR POOLS WERE REARED UNTIL ADULTS ARE EMERGED IN THE LABORATORY. RESULTS REVEALED THAT 86% HOUSEHOLDS HAVE PERMANENT RESIDENCE. PERCENTAGE INFECTED MALE: FEMALE RATIO WAS 48%: 52% WHICH IS NOT SIGNIFICANTLY DIFFERENT. THE VULNERABILITY OF THE AGE GROUPS FOR DENGUE FEVER WERE FOUND AS 1-5 YRS (24%), 6-18 YRS (44%), 19-55 YRS (24%) AND MORE THAN 55 YRS (3%). THE ADULT MOSQUITO POPULATION CONTAINED 77.6% OF AEDES ALBOPICTUS ATTAINING INDOOR (20.7%) AND OUTDOOR (79.3%) BREEDING SITES WHILE 22.4% OF AE. AEGYPTI ATTAINING INDOOR (38.6 %) AND OUTDOOR (61.4%) BREEDING SITES. ONLY 32% OF HOUSE PREMISES WERE DENSELY COVERED WITH VEGETATION. RECORDED DENGUE CASES AND GEOGRAPHIC FACTORS WERE LINKED TO A GIS DATABASE AND PRESENTED IN DIGITIZED MAPS TO SHOW DENGUE RISK FACTORS IN KELANIYA MOH AREA.
Dengue vector mosquito surveillance and dengue risks based on environmental factors in Kelaniya MOH area
(Research Symposium 2010 - Faculty of Graduate Studies, University of Kelaniya, 2010) Nadeeka, P.V.J.; Amarasinghe, L.D.
Potential dengue vector mosquito surveillance was conducted at 25 sites in Kelaniya Medical Office of Health area that contains 37 Divisional secretariat areas and 6 PHI divisions, from April 2008 to Feb 2010 at monthly intervals. Sites were selected based on census using GPS. The abundance of Aedes albopictus and Ae. aegypti was determined using ovitraps installed in out door and indoor at each site and by adult emergence rate from eggs and field caught mosquitoes. Adult mosquito species were identified morphologically. Recorded dengue cases within the Kelaniya MOH area were obtained after a written approval from Regional Director of Health Services of Gampaha. Based on the ovitrap study it was revealed that oviposition prevalence of Aedes mosquitoes in outdoor was higher than that of indoor in all the study sites. It was highest in Hunupitiya PHI division followed by Dalugama, Kiribathgoda, Peliyagoda, Kelaniya and Wedamulla divisions. The study also reveald that indoor and outdoor adult mosquito populations based on the emergence rate are dominatwed by Ae.albopictus (75%) in the study sites. The highest abundance of Ae.albopictus was recorded in Hunupitiya PHI division in the outdoor site.There were positive correlations between the number of suspected dengue patients and the abundance of Ae.aegypti (P=0.027) and Ae.albopictus(P=0.049) in indoor sites of each PHI divisions.the least number of patients and mosquito populations were recorded at Wedamulla PHI division. Within the each year of study period, there were two peaks of the outdoor mean number of eggs per ovitrap each in April and December. Indoor mean number of eggs per ovitrap was significantly correlated with number of wet days (P=0.033). However, outdoor mean number of eggs per ovitrap was significantly correlated with humidity (P=0.049).Recorded dengue cases and environmental factors were linked to GIS database and presented in digitized maps. Financial assistance from NSF RG/2007/HS/14 is highly acknowledged.
Dengue vector surveillance in Kelaniya MOH area
(Research Symposium 2009 - Faculty of Graduate Studies, University of Kelaniya, 2009) Nadeeka, P.V.J.; Amarasinghe, L.D.
Potential dengue vector mosquito surveillance was conducted at 24 sites in Kelaniya Medical Office of Health area that contains 37 Divisional secretariat areas and 6 PHI divisions, from April 2008 to March 2009 in monthly interval. Sites were selected based on census using GPS. The abundance of Aedes albopictus and Ae. aegypti was determined using ovitrap method and by field caught mosquitoes. Ovitraps were installed at the rate of three out door and three indoor at each site. The minimum distance between two sites was not less than two km. Traps were collected after two overnights. Total number of mosquito eggs in each wooden paddle collected from indoor and outdoor of each site was counted separately. The wooden paddles with eggs were left in containers half filled with hay infusion and covered using a mosquito net until adults were emerged in the laboratory. Adult mosquito species were identified morphologically. Study revealed that adult mosquito population based on the emergence rate in the study site is dominated by Ae.albopictus (77%). Peak of the abundance of Ae.albopictus in outdoor was found in period of April to July 2008. The abundance of Ae.aegypti in outdoor did not show significant difference over the study period. There was a positive correlation of monthly mean temperature with the abundance of Ae.aegypti in outdoor (P=0.03, r=0.603). Within the first six months of study period the highest outdoor mean number of eggs per ovitrap was recorded in Hunupitiya PHI division (74). However during the latter six months it was reported in Kelaniya PHI division (28). When outdoor mean number of eggs per ovitrap is considered, numbers were significantly correlated with rainfall (P=0.008, r=0.724) and humidity (P=0.02, r=0.65). Peak Ovitrap Index values were shown in period followed by heavy rains (435.9mm), from April to July in both indoor 47.6-68.2% and outdoor 80.9- 90.9%. Lower Ovitrap index values were resulted in January where low level of rain fall is experienced (140.9mm).
Geographic, Economic and Socio-cultural factors defining risk of dengue transmission in Kelaniya, Sri Lanka
(Journal of Experimental Biology and Agricultural Sciences, 2014) Nadeeka, P.V.J.; Gunathilaka, P.A.D.H.N.; Amarasinghe, L.D.