The U.S. Health and Human Services released a report reviewing medical interventions for minors seeking gender-affirming care. In the 400-page review published May 1, unnamed authors determined there’s a lack of evidence supporting interventions such as puberty blockers,

The potential change outlined in a statement would require all new vaccines to undergo placebo testing, sparking concerns among medical experts.

Here are eight possible indicators of how health secretary Robert F. Kennedy Jr. may handle U.S. vaccine policy in coming weeks.