In other measles news, Kentucky has reported a case in an adult who had recently traveled internationally.
Experts say the move is very concerning for public health, particularly amid the growing measles outbreak in neighboring Texas.
President Javier Milei says the WHO promoted "endless quarantines" without scientific support during the pandemic.
The KFF poll, conducted earlier this month, also teases out impressions of Trump's health nominees and perceptions about the H5N1 threat.
With moderately high trust in scientists, respondents wanted a higher priority on public health, energy challenges, and poverty.
Yet two public health experts argue that the First Amendment and other factors preclude such actions.
Children with a vaccine-hesitant parent varied by vaccine: 56% for COVID, 31% for flu, 30% for HPV, and 12% for other childhood illnesses.
The paper has already led to much confusion and has been used as fodder for anti-vaccine advocates.
The false belief is undermining efforts to address the country's rising measles cases through vaccination.
The proportion of respondents who believe in the safety of vaccines fell from 77% in April 2021 to 71% in fall 2023.
