Burden of dengue fever and investigating challenges,Melur block,Tamilnadu,India
Journal Title: Stanley Medical Journal - Year 2016, Vol 3, Issue 4
Abstract
Introduction: Dengue has fast emerged to be an important public health problem for its ability to occur in large scale outbreaks .During the 1st week of October 2012, there were reports of rapid increase in number of fever cases reported from Melur block of Madurai. On 10th of October 2012 an Outbreak investigation was initiated along with the district health team with the objectives were to confirm the existence and recommend control measures Methods: The standard case definitions provided by the National Vector Borne Disease Control Programme (NVBDCP)2 were used. A confirmed case was defined as demonstration of dengue virus antigen (NS1 Ag) in serum samples by ELISA. We used active (door-to-door survey) and stimulated passive (healthy facility-based) surveillance to identify cases. We described the outbreak by time, place, and person. Environmental survey was conducted information on frequency of water supply, water storage practices and number of waste containers with and without larvae was collected. We drew line graphs to describe time trends and created area maps. Calculation of attack rate for blocks , age & gender specific attack rates and case fatality ratio . Results: We identified 260 case-patients of Dengue among the 127492 residents [Attack rate 0.2%], there were seven deaths reported [ case fatality2.7%] . The attack rate was higher among females and in the age-group of 50 years and above. We also identified 2330 suspected fever cases among 127492 residents[ Attack Rate 18%] .The age groups were 6 to 14 years and females were most affected. Nearly 70% of the case-patients had fever and headache . The cases began appearing during the first week of September 2012, followed by a rapid increase to peak on 1 week of October and, thereafter, declined from 24 October with the. Cases were spread out around six major streets of Therkutheru area on either side of Melur High. Larval indices index were signifact in areas Therkutheru ,Vellalapatti , Vellalore Keelavalavoo ,Thiruvathavoor. The correlation coefficient of cases of dengue is 0.67 with House Index, 0.65 with container index and was 0.68 with Breateau index .The identified vector i n causation of this outbreak is Aedes a egypti. Viruses identified: Dengue virus type 2 and 3. Conclusion: There was a resurgence of dengue virus infection in the effected area. Unprecedented rains and irregular water supply leading to water storage and larval breeding
Authors and Affiliations
MSP Saravanan, Tony Fredrick, Yuvaraj Jayaraman, Murali Ramamoorthy, Joseph k David, Hema Vaithianathan
Keywords
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