Clinico-epidemiological features of the hospitalized patients with 2009 pandemic influenza A (H1N1) virus infection in Saurashtra region, India (September, 2009 to February, 2010) (original) (raw)

were found in pigs in United States (US). Further on, it has been found that this new virus has gene segments from the swine, avian and human flu virus genes. The scientists call this a 'quadruple reassortant' virus and hence this new (novel) virus is christened "Influenza A (H1N1) virus". [1-3] The World Health Organization (WHO) raised the pandemic level from 5 to 6, the highest level after the documentation of human to human transmission of the virus in at least three countries in two of the six world regions defined by the WHO. [4,5] The first case of confirmed infection with the virus in India was documented in May, 2009, [6] but only few cases were reported up to August, 2009. After that large numbers of positive cases were reported throughout the Background: The first case of 2009 pandemic influenza A (H1N1) virus infection in India was reported in May, 2009 and in Saurashtra region in August, 2009. We describe the clinico-epidemiological characteristics of patients who were hospitalized with 2009 influenza A (H1N1) infection in Saurashtra region. Materials and Methods: From September, 2009 to February, 2010, we observed 274 persons infected with 2009 influenza A (H1N1) virus who were admitted in different hospitals in Rajkot city. Real-time reverse-transcriptase-polymerase-chain-reaction (RT-PCR) testing was used to confirm infection; the clinico-epidemiological features of the disease were closely monitored. Results: Of 274 patients, median age was 29.5 years, and 51.5% were males. Only 1.1% patients had recent travel history to infected region. Median time of five days was observed from onset of illness to influenza A (H1N1) diagnosis, while median time of six days reported for hospital stay. All admitted patients received oseltamivir drug, but only 16.1% received it within two days of onset of illness. One fourth of admitted patients were expired. The most common symptoms were cough (96.7%), fever (92%), sore throat and shortness of breathing, and coexisting conditions including diabetes mellitus (9.9%), hypertension (8.8%), chronic pulmonary diseases (5.5%) and pregnancy (5.5%) (P<0.05). Pneumonia was reported in 93% patients with chest radiography. Conclusion: We have demonstrated that infection-related illness affects both children and adults with survival of 74% patients. The median time from onset of illness to virus detection with use of real-time RT-PCR is five days. Pregnancy is found as a significant (P<0.05) risk factor for severe disease.