President Donald Trump has signed an executive order aiming to change vaccine policy in the US. The order suggests altering the way the MMR vaccine is administered, which protects against measles, mumps, and rubella. Instead of the current combination vaccine, the order proposes giving three separate shots for each disease.

Experts in immunology and vaccine development disagree with this approach. Further details on the potential impact of this change are available from the source, including concerns from experts about the effects on public health and the complexity of implementing such a change.