H1N1 influenza virus causes viral disease, commonly known as swine flu, which mostly affects the respiratory system. Swine flu is characterized by infection from H1N1 strain. Symptoms of H1N1 flu are fever, cough, sore throat, runny or stuffy nose, watery and red eyes, body aches, headache, fatigue, and diarrhea. H1N1 spreads through contact with contaminated air or geographical locations infected with virus. H1N1 infection may worsen other chronic respiratory conditions such as bronchitis, pneumonia, COPD, and sometimes even death due to respiratory failure.