Descriptive Epidemiology of Novel Influenza A (H1N1), Andhra Pradesh 2009-2010.
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Date
2013-07
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Abstract
Background: The fi rst case of pandemic Infl uenza A (H1N1) in India was reported from Hyderabad, Andhra Pradesh
on 16th May 2009. Subsequently, all suspected cases seeking treatment from A (H1N1) treatment centers and
their contacts were tested. Laboratory confi rmed cases were hospitalized and treated with antivirals according to
national guidelines. We reviewed the surveillance data to assess the morbidity and mortality due to A (H1N1) in the
state of Andhra Pradesh (population-76,210,007) during the period from May 2009 to December 2010. Materials
and Methods: We obtained the line-list of suspected (infl uenza like illness as per World Health Organization case
defi nition) and laboratory confi rmed cases of A (H1N1) from the state unit of integrated disease surveillance project.
We analyzed the data to describe the distribution of case-patients by time, place and person. Results: During May
2009 to December 2010, a total of 6527 suspected (attack rate: 8.6/100,000) and 1480 (attack rate: 1.9/100,000)
laboratory confi rmed cases were reported from the State. Nearly 90% of the suspected and 93% of the confi rmed
cases was from nine districts of Telangana region, which includes Hyderabad. Nearly 65% of total confi rmed cases
were reported from Hyderabad. The attack rate was maximum (2.6/100,000) in the age group of 25-49 years. The
cases peaked during August-October. 109 case-patients died (Case fatality ratio: 7%) and most (80%) of these patients
had comorbid conditions such as diabetes (24%), chronic obstructive pulmonary disease (20%), hypertension (11%)
and pregnancy (11%). Case fatality was higher (16%) among patients who were older than 60 years of age compared
with other age groups. Conclusions: In Andhra Pradesh, H1N1 transmission peaked during August-October months
and predominately affected adults. Case fatality was higher in patients older than 60 years with comorbid conditions.
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Keywords
Andhra Pradesh, H1N1, Mortality
Citation
Allam Ramesh R, Murhekar Manoj V, Tadi Geetha P, Udaragudi Prasada R. Descriptive Epidemiology of Novel Influenza A (H1N1), Andhra Pradesh 2009-2010. Indian Journal of Public Health. 2013 Jul-Sept; 57(3): 161-165.