Epidemiological investigation of an outbreak of chikungunya in hyderabad and nalgonda districts of andhra pradesh, India.

After about three decades, Chikungunya infection has re-emerged in India and the first cases were reported in December, 2005. The outbreak has currently affected about 8 states in the country. Although known to be commonly non fatal, since the present outbreak involved a large population, it has been raised as an issue of public health concern and also attracted wide media attention. The clinico-epidemiological and entomological review of the Chikungunya outbreak situation in Hyderabad and Nalgonda Districts of Andhra Pradesh, which started in December 2005, revealed that it is under control. However, preventive efforts need to continue and disease surveillance for early detection of potential outbreaks further strengthening. Given the significantly high House Index, all the three study areas remain at significant risk of outbreaks in the future if appropriate control measures are not put in place. Community support and participation is also crucial for the prevention of future outbreaks and improving the health and well being of population in the districts.