The outbreak of the influenza a virus (H1N1) born in Mexico during the spring of 2009 and spread quickly around the world. Most infections occur in children and adults. The infected patients will have symptoms, reaching slightly more severe stages. However, Some patients with severe symptoms, and most of the dead are adults aged between 20-50 years, both with or without major medical conditions. The majority of patients with respiratory failure due to pneumonia. In addition, in vivo, which is infection of the occurrence of influenza a virus is higher than the 2009 seasonal influenza.
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