The flu is caused by the influenza virus. Each winter, the virus spreads around the world. The strains are usually different from one year to the next.
The two main kinds of influenza viruses, Type A and Type B.
Someone infected with the virus may sneeze or cough. This releases droplets in the air. If you breathe in infected droplets you can become infected. You can also become infected through touch. If you touch a contaminated surface, you may transfer the virus from your hand to your mouth or nose.
Factors that increase your chance of the flu include:
All the remaining factors increase the risk of developing complications from flu:
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