Measles - Causes
Measles is a very contagious disease. That is, it can be transmitted from one person to another very easily. The usual method of transmission is through coughing or sneezing. The virus that causes measles is contained in tiny droplets of moisture released when an infected person coughs or sneezes. A person who inhales those droplets will almost certainly develop measles.
The incubation period for measles is seven to eighteen days. The incubation period is the time between the moment the virus enters a person's body and the appearance of symptoms. A person is contagious (capable of passing on the infection) from three to five days before symptoms appear to about four days after the rash shows up.

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