(PUEBLO, Colo.) — On Monday, March 31, the Colorado Department of Public Health and Environment (CDPHE) reported that a person tested positive for measles in Colorado after returning home from a trip to Mexico. CDPHE stated that the person sought medical attention on Tuesday, March 22, to get t reated, adding they believe this case was similar to those found in Texas and New Mexico. Now, state officials are working to determine how many could have been exposed. "Measles is actually the most transmissible infectious disease that we know of," said Dr. Rachel Herlihy, CDPHE. "It's much more infectious than other infectious diseases that we see more commonly." According to CDPHE, the patient was not vaccinated for measles and began showing symptoms after returning home. They visited the Southern Colorado Clinic in Pueblo on March 22. The clinic is one of two locations officials believe people could have been exposed to the virus, along with the Southwest Deli and Café between March 17 and 21. "The good news is, is that this individual has not traveled outside of Pueblo," said Randy Evetts, Director, Pueblo Public Health and Environment. "And so we believe it is limited to Pueblo." Local officials said recent data for Pueblo County showed child vaccination rates for measles are consistent with the state average at 88%, making the main concern figuring out who was unvaccinated and exposed, as officials say those people have the highest risk. "If there are ten non-immune people that are exposed to measles, nine of them will go on to develop infection," said Dr. Herlihy. If anyone was exposed and is showing symptoms, state officials urge them to immediately contact their local health care provider to figure out the next steps. "The time from exposure until the time that someone develops symptoms, which is called the 'incubation period,' is typically going to be about 10 to 12 days," said Dr. Herlihy. As for the current condition of the person with measles, state officials said they are doing well and have "Finished the course of the infection." ...read more read less