School starts soon in north-central Colorado and pediatrician Shen Nagel, MD, is bracing for the possibility of a measles outbreak. 

In some ways this is par for the course. After major holidays and summer breaks, kids bring viruses back to their classrooms, and Nagel sees spikes of flu, respiratory syncytial virus and other respiratory illnesses, among his patients at Pediatrics West, a practice in suburban Denver.

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