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Influenza H1N1 virus, also known as swine flu, is a subtype of the influenza A virus. It emerged in 2009 as a pandemic strain, spreading rapidly across the globe. The virus is named for its surface proteins: hemagglutinin (H1) and neuraminidase (N1).

Key Points:
1. Origins: The 2009 H1N1 virus is a novel strain that resulted from the reassortment of four different influenza viruses from pigs, birds, and humans.
2. Symptoms : Similar to seasonal flu, symptoms include fever, cough, sore throat, body aches, headache, chills, and fatigue. Some cases may include diarrhea and vomiting.
3. Transmission : H1N1 spreads through respiratory droplets when an infected person coughs or sneezes. It can also spread by touching surfaces contaminated with the virus and then touching the face.
4. Impact : The 2009 H1N1 pandemic caused significant illness and death worldwide. It particularly affected younger people and those with underlying health conditions.
5 Prevention : Vaccination is the primary method of prevention. Good hygiene practices, such as regular hand washing and using tissues when coughing or sneezing, also help reduce transmission.
6. Treatment : Antiviral medications like oseltamivir (Tamiflu) and zanamivir (Relenza) can reduce the severity and duration of illness if taken soon after symptoms begin.

Understanding the nature and behavior of H1N1 helps in managing and preventing its spread during flu seasons.