In this episode of Science Quickly, we examine the surge in measles cases across the U.S., exploring how falling measles, mumps and rubella (MMR) vaccination rates, the rising use of exemptions and pockets of misinformation are creating hot spots where the highly contagious virus can spread. SciAm’s associate editor for health and medicine Lauren Young and public health experts break down why outbreaks are intensifying.

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Science Quickly is produced by Kendra Pierre-Louis, Fonda Mwangi, Sushmita Pathak and Jeff DelViscio. This episode was edited by Alex Sugiura, with fact-checking by Shayna Posses and Aaron Shattuck. Our theme music was composed by Dominic Smith.

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