The cases in Kansas are likely part of the mushrooming outbreak that began in West Texas in late January. On March 13, Kansas reported a single measles case, the first the state had seen since 2018. The nine cases reported last week had ties to that original case.

Spreading infections and misinformation

On Wednesday, KDHE Communications Director Jill Bronaugh told Ars Technica over email that the department has found a genetic link between the first Kansas case and the cases in West Texas, which has similarly spread swiftly in under-vaccinated communities and also spilled over to New Mexico and Oklahoma.

“While genetic sequencing of the first Kansas case reported is consistent with an epidemiological link to the Texas and New Mexico outbreaks, the source of exposure is still unknown,” Bronaugh told Ars.

Bronaugh added that KDHE, along with local health departments, is continuing to work to track down people who may have been exposed to measles in affected counties.

In Texas, meanwhile, the latest outbreak count has hit 327 across 15 counties, mostly children and almost entirely unvaccinated. Forty cases have been hospitalized, and one death has been reported—a 6-year-old unvaccinated girl who had no underlying health conditions.

On Tuesday, The New York Times reported that as measles continues to spread, parents have continued to eschew vaccines and instead embraced “alternative” treatments, including vitamin A, which has been touted by anti-vaccine advocate and current US Health Secretary Robert F. Kennedy Jr. Vitamin A accumulates in the body and can be toxic with large doses or extended use. Texas doctors told the Times that they’ve now treated a handful of unvaccinated children who had been given so much vitamin A that they had signs of liver damage.

“I had a patient that was only sick a couple of days, four or five days, but had been taking it for like three weeks,” one doctor told the Times.

In New Mexico, cases are up to 43, with two hospitalizations and one death in an unvaccinated adult who did not seek medical care. In Oklahoma, officials have identified nine cases, with no hospitalizations or deaths so far.