https://iowacapitaldispatch.com/2023/12/19/about-10-of-iowans-have-sufficient-covid-vaccination/

The number of Iowans who have up-to-date COVID-19 vaccinations has plummeted in recent months, after the threat of the disease reached a pandemic low and federal officials ended a public health emergency declaration. ...

The CDC attributes the overall low vaccine uptake to a lack of proactive recommendations by health care providers, concerns about side effects and simply forgetting to get vaccinated.