Demographic characteristics and underlying medical conditions of influenza A (H1N1)pdm09 virus-associated pneumonia fatalities in Thailand, May 2009-January 2010.

*According to WHO on Clinical Management of Human Infection with influenza A(H1N1)pdm09 [15].†Kidney disease includes chronic renal failure, polycystic kidney disease.‡Obesity defined as body mass index (BMI) ≥30 kg/m2. BMI calculated as weight in kilograms divided by height in meters squared among non-pregnant patients; 14 patients overall and 13 patients with medical records reviewed had height and weight available BMI calculation.§Chronic lung disease includes obstructive pulmonary disease, chronic bronchitis, and pulmonary tuberculosis.