Why are measles cases popping up across the United States? Here's what to know about the highly contagious virus
Briefly

Nearly a dozen cases of measles have been reported in Pennsylvania, Virginia, and Georgia in recent weeks, according to local health departments.
The Philadelphia Department of Public Health has confirmed at least nine cases of measles over the past month after a person contracted the highly contagious virus outside the United States and exposed a parent and child at a children's hospital, according to health department spokesperson James Garrow.
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