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Outbreak of Chikungunya Fever, Dakshina Kannada District, South India, 2008

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  • Regional Medical Research Centre (Indian Council of Medical Research), Port Blair, Andaman and Nicobar Islands, India; District Health and Family Welfare Office, Primary Health Centre, Adyanadka, Dakshina Kannada, Karnataka, India; National Institute of Virology, Pune, Maharashtra, India

The outbreak of chikungunya fever that surfaced in India during late 2005 has affected more than 1.56 million people, spread to more than 17 states/union territories, and is still ongoing. Many of these areas are dengue- and leptospirosis-endemic settings. We carried out a cross-sectional survey in one such chikungunya-affected location in Dakshina Kannada District of Karnataka State to estimate the magnitude of the epidemic and the proportion of chikungunya virus (CHIKV) infections that remained clinically inapparent. The seropositivity for CHIKV infection was 62.2%, and the attack rate of confirmed CHIK fever was 58.3%. The proportion of inapparent CHIKV infection was 6.3%. The increasing trend in the seropositivity and attack rate of CHIKV infection with age group was statistically significant. The present study is an indicator of the magnitude of the ongoing outbreak of CHIKV infection in India that started during 2005–2006.

Author Notes

*Address correspondence to Paluru Vijayachari, Regional Medical Research Centre (RMRC-ICMR), Dollygunj, Port Blair 744 101, Andaman and Nicobar Islands, India. E-mail: vijayacharip@yahoo.com

Financial support: The study was supported by the internal funds of Regional Medical Research Centre, Port Blair (Indian Council of Medical Research).

Authors' addresses: Sathya P. Manimunda, Attayur P. Sugunan, Paluru Vijayachari, Ananganallur N. Shriram, Sameer Sharma, Nagarajan Muruganandam, Itta K. Chaitanya, and Dev R. Guruprasad, Regional Medical Research Centre (RMRC-ICMR), Port Blair 744 101, Andaman and Nicobar Islands, India, E-mails: sathyamanimunda@rediffmail.com, apsugunan@gmail.com, vijayacharip@yahoo.com, shriraman@icmr.org, meabhisharma@rediffmail.com, n.muruganandam@gmail.com, chaitanyaitta@gmail.com, and guruprasad.prasad1983@gmail.com. Subhodh K. Rai, Department of District Health and Family Welfare, Adyanadka 574260, Karnataka, Dakshina Kannada, India, E-mail: sathya_pblair@yahoo.co.in. Anakkathil B. Sudeep, National Institute of Virology, Pune 411 021, Maharashtra, India, E-mail: sudeepmcc@yahoo.co.in.

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