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module menu icon How many types of flu viruses affect human beings?

There are 3 types of flu viruses that affect humans.

Type A – usually the more serious type that tends to cause the outbreaks in most years and they are the ones responsible for the pandemics.

Type B – tend to causes less severe disease and smaller outbreaks affecting mostly children.

Type C – causes mild illness similar to the common cold.

A fourth type, D virus, primarily affect cattle and is not known to infect or cause illness in humans.