What Des Moines residents should know after Polk County’s July measles exposure notice

Polk County’s 21-day monitoring window tied to its July measles exposure notice ended July 26, and county officials said the exposure did not create an ongoing outbreak risk.

The update gives Des Moines residents a clearer status after health officials identified exposure locations in the city and nearby communities. It does not eliminate the possibility of future measles cases, so residents should still know the symptoms and how to seek care safely.

What happened in Polk County

Polk County health officials confirmed measles in a vaccinated Polk County resident who had recently traveled internationally. The county’s July 8 notice listed Des Moines exposure locations on July 1, July 2 and July 4. It also listed nearby exposure locations in Webster City, Altoona and West Des Moines on July 3, July 4 and July 5.

July 5 was the final identified community exposure date. Because measles symptoms can develop within a 21-day period after exposure, July 26 marked the end of the monitoring window tied to that notice.

Polk County Health Director Juliann Van Liew told KCCI on July 26 that people were beyond the expected symptom window, so officials no longer considered that case an ongoing outbreak risk. KCCI previously reported that disease investigators followed up with 109 potentially exposed people. That follow-up does not mean every person was infected or tested; it describes the public-health response to people who may have encountered the case.

Symptoms to watch for

Measles can begin with a high fever, cough, runny nose and red or watery eyes. Small spots may appear inside the mouth, followed by a rash that commonly starts on the face and spreads downward.

Anyone who develops possible measles symptoms should stay home and avoid work, school, child care and public places. Call a health care provider before arriving at a clinic, urgent care center or emergency department so staff can prepare for a possible exposure.

Residents who do not have a health care provider can contact the Polk County Health Department at 515-323-5221 for guidance.

What to do if vaccination records are uncertain

Residents who are unsure whether they received the recommended measles, mumps and rubella, or MMR, vaccinations should check with a health care provider. People who are unvaccinated, immunocompromised, caring for an exposed infant or otherwise concerned about their risk should seek individualized guidance rather than waiting for symptoms.

Two documented MMR doses provide strong protection against measles. The confirmed Polk County case involved a vaccinated person, but that breakthrough infection should not be interpreted as evidence that vaccination is ineffective. Iowa HHS says vaccination remains a key tool for limiting measles transmission, and Polk County officials said vaccinated people who experience breakthrough infection generally have milder illness and are less likely to spread measles.

What Iowa health officials emphasized

In its July 24 update, Iowa HHS said the state had recorded its first measles case of 2026. The agency stressed rapid recognition, testing, isolation, vaccination and public-health response as key steps for limiting spread in Iowa.

Iowa HHS reported that 2025 MMR coverage was 83% among children age 2 and 88.9% among kindergartners receiving two doses. The agency said achieving and sustaining at least 95% routine childhood coverage remains the most effective strategy for preventing future outbreaks and poor outcomes in Iowa.

For Des Moines residents, the current local status is that Polk County officials reported no continuing outbreak risk from the July exposure period as of July 26. Anyone who develops fever, respiratory symptoms, mouth spots or a spreading rash should stay home, call ahead before seeking medical care and contact the Polk County Health Department at 515-323-5221 if provider guidance is unavailable.

Sources

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