Norovirus symptoms: How the winter bug is spread – how long are you contagious?

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According to the CDC, people with norovirus shed billions of virus particles per day, only some of which make people sick.

When people with the virus begin to shed these particles, it spreads in a similar way to the flu or common cold.

People contract the disease by getting norovirus particles in their mouth, by eating infected food or having direct contact with an infected person.

The virus can also stick to surfaces, meaning it can spread via public transport.

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