Influenza A H3N2 Outbreak in Drug Rehabilitation Camp in Nakhon Ratchasima Province, Thailand, August 2011
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Influenza A H3N2, drug rehabilitation camp, Nakhon Ratchasima province, ThailandAbstract
On 25th August 2011, Bureau of Epidemiology was notified by Nakhon Ratchasima Provincial Health Office about an influenza outbreak in drug rehabilitation camp. The investigation was conducted during 26th – 28th August 2011 with objectives to identify risk factors and recommend proper prevention and control measures. Active case finding was conducted. The suspect case was defined as any person in camp who got fever and cough and/or sore throat since 17th – 28th August 2011 and confirmed case was a suspected case with positive result of reverse transcriptase-PCR for influenza virus. Retrospective cohort study was conducted to determine risk factors. We also give prevention and control measures. Of 250 attendants, 72 (Attack rate = 29%) met suspected cases. The first case was found on 17th August 2011 and the number of cases peaked on 23rd August 2011. Influenza A H3N2 infection were confirmed in 8 cases. Taking a nap with patients was a significant risk factor (Adjusted Odds Ratio=2.21, 95%CI=1.17-4.16). Case isolation, influenza mass vaccination and health education was implemented. Incidence of influenza cases decreased rapidly and the last case was reported on 26th August 2011. Influenza A H3N2 outbreak was confirmed and occurred among attendants. Taking a nap with patient was identified as significant risk factor of infection. Decisions on intervention measures were made effectively several days before laboratory results became available.
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