DENGUE OUTBREAK;

Descriptive epidemiological analysis and vector surveillance in District Faisalabad during 2011.

Abstract

Background: This longitudinal study was conducted during August to December 2011 in District Faisalabad to analyze
epidemiological pattern of dengue outbreak in the district. Weekly trends of all cases (893) reported through Disease Surveillance System
from week No.33 to 54 were monitored. On the basis of this continuous flow of information, different ongoing vector control measures
were adopted simultaneously in different areas of the district and larval indices were calculated. Methods: The Surveillance data was used
to monitor the trends of the outbreak in terms of time, person and place. Teams of 3102 trained workers were formed to conduct various
surveillance activities like vector surveillance, fogging, larviciding, and indoor residual sprays. During indoor and outdoor vector
surveillance, teams also calculated the larval indices for vector control. Results: The rural to urban ratio of cases was 1:3. Maximum
cases (215) were reported from Jinnah Town in urban area and (102) cases were reported from Tehsil Sadar among the rural areas. Most
cases of dengue fever were observed during the 40-45 weeks of the year 2011. Mean age was 29±14.7 years for rural and 35±16.5
years for urban. Male to Female ratio was 1.2:1 in urban and 1.8:1 in rural areas. Majority of the cases belonged to the age group 21-30.
The case fatality rate was 6/1000 cases. The house lndex was 1.03%, the indoor container index was 0.26% and the breateu index was
found 1.21%. Conclusions: Maximum cases occurred during 44th and 45th weeks. Male were affected more as compare to females.
Jinnah Town in urban areas and Tehsil Sadar among the rural areas reported maximum number of cases. The different calculated larval
indices like house index, indoor/outdoor container index and breateu index showed moderate larval growth and hence, the outbreak was
within control.