For example, when testing a new seasonal allergy medicine, the risk to participants from giving them a placebo is low – worst case scenario, they’ll have their usual hay fever symptoms.

HHS to require placebo testing of ‘all new vaccines,’ raising questions about approval of updated Covid-19 shots Andrew Harnik/Getty Images via CNN Newsource Under Secretary Robert F. Kennedy Jr.

And while vaccines for new pathogens are often tested using a placebo, it’s unclear if HHS would require the same testing for already well-researched vaccines, including the MMR vaccine, which ...

(CNN) — The US Department of Health and Human Services said it will require that all new vaccines be tested in placebo-controlled trials before they’re licensed for use, raising urgent ...

The potential change outlined in a statement says all new vaccines will be required to undergo placebo testing, a procedure in which some people receive the vaccine and others receive an inert ...

HHS to require placebo testing of ‘all new vaccines,’ raising questions about approval of updated Covid-19 shots By CNN Newsource Published April 30, 2025 9:14 PM ...

For example, when testing a new seasonal allergy medicine, the risk to participants from giving them a placebo is low – worst case scenario, they’ll have their usual hay fever symptoms.