Arizona measles outbreak reaches ‘critical point’: Health officials believe the Phoenix-area woman recently diagnosed with measles may have exposed as many as 195 children to the disease at the Phoenix Children’s East Valley Center on Jan. 20 and 21. Maricopa County officials were in the process of contacting the children’s families Tuesday. A hospital official told 12 News that the woman was not an employee and it was not known why she was at the facility.