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Influenza A virus subtype (H1N1)

  • Also known as A (H1N1) or Swine Flu Virus
  • A subtype of Influenza A and the most common cause of Influenza (flu) in humans.
  • This virus was originally referred to as “swine flu” because laboratory testing showed that many of the genes in this new virus were very similar to influenza viruses that normally occur in pigs in North America.
  • H1N1 viruses are not spread by food. You cannot get this new HIN1 virus from eating pork or pork products.
  • Categorized according to two proteins found on the surface of the virus: hemagglutinin (HA), that binds sugars, then the cell releases acid molecules making HA refolding in a different way. It is responsible for binding the virus to the cell that is being infected. It comes from the protein's ability to cause red blood cells to clump together. Viral neuraminidase (N) is an enzyme on the surface of influenza viruses that enables the virus to be released from the host cell.

Signs and Symptoms

  • flu-like, including fever
  • cough
  • headache
  • muscle and joint pain
  • sore throat and runny nose
  • vomiting or diarrhea
Mode of Transmission
  • Outbreaks in humans are now occurring from human-to-human transmission.
  • When infected people cough or sneeze, infected droplets get on their hands, drop onto surfaces, or are dispersed into the air.
  • Person can breathe in contaminated air, or touch infected hands or surfaces, and be exposed.
  • To prevent spread, people should cover their mouth and nose with a tissue when coughing.
  • Washing your hands often with soap and water, especially after you cough or sneeze.
  • Staying home from work or school if you are sick.
  • Eating properly handled and cooked pork product.
  • Oseltamivir (Tamiflu) is approved to both treat and prevent influenza A and B virus infection in people one year of age and older.
  • Zanamivir (Relenza) is approved to treat influenza A and B virus infection in people 7 years and older and to prevent influenza A and B virus infection in people 5 years and older.


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