NCIt synonyms : Swine Influenza; Influenza A (H1N1); H1N1 Flu; Swine Flu; H1N1 Virus Infection; Influenza A (H1N1) Virus Infection;
NCIt definition : An acute viral respiratory infection caused by a strain of influenza virus which is
endemic in swine (pigs). Rarely reported in humans prior to 2009, the disease is caused
by a mutated strain of swine influenza A (H1N1) virus. It is highly contagious and
spreads mainly through coughing and sneezing. Signs and symptoms include fever, chills,
coughing, sore throat headache, muscle ache, and generalized weakness. Antiviral medications
are most effective in the first two days of the illness.;