What Makes a Virus Spread Like Wildfire?

Viruses are like tiny fire starters. Imagine a virus is like a match, it lights one person on fire, and then that person becomes a whole bonfire of infection. If the virus is very contagious, each infected person can light up many more people, like a wildfire spreading through a forest.

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Examples

A sneeze from one kid can make an entire classroom sick.
A virus can jump between people in seconds, just like a game of tag.
A single infected person on a plane can spread the virus to dozens.

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Categories: Biology · virus,epidemiology,infection