As new cases are reported, our maps and illustrations show the spread of the virus and how infections can run through a community.

Three hundred and fifty-five cases have been reported in the ongoing measles outbreak in Texas, New Mexico and Oklahoma, but local officials say that it’s an undercount and that the virus could continue to spread spread for months.

Measles cases in West Texas are still rising two months after the outbreak began. Local public health officials say they expect the outbreak to last for at least several more months and the case number is likely an undercount.