Measles arrives in Kansas, spreads quickly in undervaccinated counties

Since a single case last week, at least 9 more have been reported with more pending.

Measles has arrived in Kansas and is spreading swiftly in communities with very low vaccination rates. Since last week, the state has tallied 10 cases across three counties with more pending.

On March 13, health officials announced the state's first measles case since 2018. The case was reported in Stevens County, which sits in the southwest corner of the state. As of now, it's unclear if the case is connected to the mushrooming outbreak that began in West Texas.

That initial case in Kansas already shows potential to mushroom on its own. Stevens County contains two school districts, both of which have extremely low vaccination rates among kindergartners. By the time children enter kindergarten, they should have their two doses of Measles, Mumps, and Rubella (MMR) vaccine, which together are 97 percent effective against measles. In the 2023–2024 school year, rates of kindergartners with their two shots stood at 83 percent in the Hugoton school district and 80 percent in the Moscow school district, according to state data. Those rates are significantly below the 95 percent threshold needed to block the onward community spread of measles—one of the most infectious viruses known to humankind.

As of today, March 21, Stevens County has reported three more cases—two confirmed and one epidemiologically linked probable case—bringing the total to four cases. And there's more to come.

"We do have pending cases at this time," the county's health department wrote in a Facebook update this afternoon. "We want to keep our community informed—this is a fluid situation and we are focused on working closely with the identified positives and their contacts."

On the west border of Stevens sits Morton County, which on Wednesday reported three confirmed cases linked to the first case reported last week in Stevens. Morton County has two school districts, Elkhart and Rolla. The vaccination coverage for kindergartners in Elkhart in 2023–2024 was also a low 83 percent, while the coverage in Rolla was not reported.

On Thursday, the county on the northern border of Stevens, Grant County, also reported three confirmed cases, which were also linked to the first case in Stevens. Grant County is in a much better position to handle the outbreak than its neighbors; its one school district, Ulysses, reported 100 percent vaccination coverage for kindergartners in the 2023–2024 school year.

Outbreak risk

So far, details about the fast-rising cases are scant. The Kansas Department of Health and Environment (KDHE) has not published another press release about the cases since March 13. Ars Technica reached out to KDHE for more information but did not hear back before this story's publication.

The outlet KWCH 12 News out of Wichita published a story Thursday, when there were just six cases reported in just Grant and Stevens Counties, saying that all six were in unvaccinated people and that no one had been hospitalized. On Friday, KWCH updated the story to note that the case count had increased to 10 and that the health department now considers the situation an outbreak.

Measles is an extremely infectious virus that can linger in airspace and on surfaces for up to two hours after an infected person has been in an area. Among unvaccinated people exposed to the virus, 90 percent will become infected.

Vaccination rates have slipped nationwide, creating pockets that have lost herd immunity and are vulnerable to fast-spreading, difficult-to-stop outbreaks. In the past, strong vaccination rates prevented such spread, and in 2000, the virus was declared eliminated, meaning there was no continuous spread of the virus over a 12-month period. Experts now fear that the US will lose its elimination status, meaning measles will once again be considered endemic to the country.

So far this year, the Centers for Disease Control and Prevention has documented 378 measles cases as of Thursday, March 20. That figure is already out of date.

On Friday, the Texas health department reported 309 cases in its ongoing outbreak. Forty people have been hospitalized, and one unvaccinated child with no underlying medical conditions has died. The outbreak has spilled over to New Mexico and Oklahoma. In New Mexico, officials reported Friday that the case count has risen to 42 cases, with two hospitalizations and one death in an unvaccinated adult. In Oklahoma, the case count stands at four.

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