When was your last cold?

Over 200 different viruses cause the common cold. Cold and flu viruses change themselves often, so you will never be completely immune to these common infections. Even if you become immune to one cold virus, you can still become ill with another virus or another form of the same virus. On average, adults catch between two and five colds every year, while children catch between four and eight. People who live in cities and children at school may have even more.

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