Causes of Cold and Flu

Colds and flu are caused by viruses. The infections are contagious, passed on by tiny droplets and hand contact.

There are hundreds of different types of virus that can cause a cold, which explains why children get repeated colds.

Flu is caused by the influenza virus. There are three major types: A (often the cause of flu epidemics), B and C. The flu virus is constantly changing its structure, so new strains appear each year. We don’t have immunity to the new strains, which is why we can catch flu repeatedly.



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