Colorado has recorded 12 measles cases so far this year , which is the most the state has seen in a single year since at least 1996.

Measles is one of the most contagious diseases to affect humans, and can linger in the air for up to two hours. People who visited an exposure location should monitor themselves for symptoms for three weeks.

Initial symptoms include a fever, cough, runny nose and red eyes. The red facial rash typically appears about four days after someone becomes contagious.

Anyone who visited an exposure location and develops symptoms should call ahead before seeking medical care, so their provider can protect other patients.

Colorado public health officials say people who visited the following locations — in Denver, Aurora, Glendale, Windsor, Colorado Springs and Gra

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