What is the definition of H1N1 Influenza?

The H1N1 virus (swine flu) is an infection of the nose, throat, and lungs. It is caused by the H1N1 influenza virus.

What are the alternative names for H1N1 Influenza?

Swine flu; H1N1 type A influenza

What are the causes for H1N1 Influenza?

Earlier forms of the H1N1 virus were found in pigs (swine). Over time, the virus changed (mutated) and infected humans. H1N1 is a new virus first detected in humans in 2009. It spread quickly around the world.

The H1N1 virus is now considered a regular flu virus. It is one of the three viruses included in the regular (seasonal) flu vaccine.

You cannot get H1N1 flu virus from eating pork or any other food, drinking water, swimming in pools, or using hot tubs or saunas.

Any flu virus can spread from person to person when:

  • Someone with the flu coughs or sneezes into air that others breathe in.
  • Someone touches a doorknob, desk, computer, or counter with the flu virus on it and then touches their mouth, eyes, or nose.
  • Someone touches mucus while taking care of a child or adult who is ill with the flu.

Symptoms, diagnosis, and treatment of H1N1 influenza is similar to that for the flu in general.


Centers for Disease Control and Prevention website. Influenza (flu). www.cdc.gov/flu/index.htm. Updated May 17, 2019. Accessed May 31, 2019.

Treanor JJ. Influenza (including avian influenza and swine influenza). In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases, Updated Edition. 8th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 167.

  • Condition: Coronavirus Disease 2019 (COVID-19)
  • Journal: International immunopharmacology
  • Treatment Used: Intravenous Immunoglobulin (IVIg) Combined with Hydroxychloroquine, Lopinavir/Ritonavir and Supportive Care
  • Number of Patients: 84
  • Published —
This study evaluated the effects of intravenous immunoglobulin (combines immunoglobulins donated by different people and is given by a drip; IVIg) combined with hydroxychloroquine, lopinavir/ritonavir, and supportive care in the management of severe coronavirus disease 2019 (a pandemic infection caused by a coronavirus; COVID-19).
  • Condition: Prevention of COVID-19 Severe Infectious Respiratory Disease
  • Journal: Vaccine
  • Treatment Used: Bacillus Calmette-Guérin (BCG) Vaccination
  • Number of Patients: 0
  • Published —
This review was provides evidence on the effect of Bacillus Calmette-Guérin (BCG) vaccine in preventing severe infectious respiratory disease, including COVD-19, but not tuberculosis.