Influenza viruses can spread using many different methods. Though uncommon, some people contract the flu by touching a surface or object that has the virus on it. They then touch their mouth, nose, or eyes and the virus enters the body. Research on influenza viruses shows that the virus can survive on non-porous materials such as metal for at least 24 hours. If the virus is present in mucus on a surface, it may stay active for up to 17 days.

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