Another 90 measles cases were reported last week, bringing the year’s total to 555 cases, according to the latest data from the Centers for Disease Control and Prevention.
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Measles is highly contagious, infecting up to 90 percent of unvaccinated people who are exposed to it, according to the Centers for Disease Control and Prevention. The virus can live in the air for up to two hours after an infected person coughs or sneezes, according to the CDC, meaning people can be exposed to it without ever knowing.
People can be infected for days before showing signs of the virus, such as a fever, runny nose or a rash.