All but 1 of Utah's 53 measles case-patients were unvaccinated or have unknown immunization status.
A call to develop separate measles, mumps, and rubella vaccines to replace the combined MMR shot is not backed by evidence.
Michigan has reported 28 cases this year.
The group warns that under Kennedy more childhood vaccines will be in jeopardy.
For example, while overall coverage was 82% in Gaines County, the epicenter of the outbreak, school-based rates were as low as 46%.
In other developments, South Carolina suspects community transmission in an outbreak in the Upstate region.
All of Minnesota's 10 new cases were unvaccinated, including 7 in families with recent domestic travel and 3 in international travelers.
As Minnesota and California report more cases, New Mexico declared its outbreak over after 100 cases.
Elsewhere, Israel has now reported 6 child deaths from measles, 4 of them over the past week.
Georgia's health department reports 3 new measles infections with links to the state's most recent case.
