Epidemiologicaland Entomological Investigation During An Outbreak Of Dengue Fever In Puducherry, South India

Research Article
SuhailJeelani Shah*, Shanmugavelu Sabesan and T Kalimuthu
Dengue fever, Aedes aegypti and Aedes albopictus, Outbreak, Puducherry

Dengue is a worldwide public health problem spread throughout the tropical and subtropical zones. It is endemic in south-east Asia, the Pacific, East and West Africa, the Caribbean and the Americas. Dengue fever (DF) and dengue haemorrhagic fever (DHF) are emerging major public health problems in India. This longitudinal study was conducted during September to December 2013 in Puducherry to analyse epidemiological pattern of dengue outbreak in the district. Weekly trends of all cases reported indifferent hospitals from the first week of September to last week of December were monitored.Out of the 763 blood samples collected from suspected dengue cases (as per the WHO criteria), 641 were serologically confirmed, 523 were found positive for NS1 Ag and 118 for anti-dengue antibodies (either for IgM/IgG or both). Simultaneously immature surveys were conducted in different areas of the district and larval indices were calculated. The Surveillance data was usedto monitor the trend of the outbreak in terms of time, person and place. The rural to urban ratio of cases was found to be 1:2. Maximum number of cases (98) were reported from Lawspet PHC in urban area, and 39 from Villianur PHC among the rural areas. Mostcases of dengue fever were observed during the month of October. Males were affected more as compared to females in the ratio of 1:0.8. Majority of the cases (52%) belonged to the age group 15-34.The entomological indices House Index (HI), Container Index (HI)and the Breteau Index (BI)in rual and urban areas were found to be 30.0%, 33.2%, 54.6 % and 33.3, 38.2 and 65 respectively.