As the tally of people infected with a strain of measles traced to an amusement park in California continues to climb, health officials are warning that those who choose not to vaccinate themselves or their children will almost certainly be infected if they are exposed to the disease.
They also warn that the outbreak has not yet been contained, and some health officials are expecting the number of cases to grow.
Nearly 90 people spread across seven states and Mexico have been reported infected from an outbreak traced to Disneyland in Anaheim, California.
California health officials have confirmed at least 74 cases of the disease as of Tuesday, and health officials in Alameda County near San Francisco have placed 30 babies under home isolation.
Arizona Department of Health Services Director Will Humble toldThe Arizona Republic that the outbreak is at "a critical point," and that he expects the number of cases in his state will "absolutely" increase. He said as many as 195 children were exposed to a woman who had the disease last week.