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Regulatory decisions from the FDA are often based on legal requirements like the Delaney Clause, which requires the agency to ban additives that cause cancer in animals or humans, said Jessica Steier, a public health expert at Unbiased Science.

“The key issue here is distinguishing between hazard and harm,” Steier told Salon in an email.

“While removing specific ingredients may create the illusion of meaningful action, it potentially diverts resources from more impactful health initiatives and promotes a simplistic ‘natural equals healthy’ narrative that doesn't hold up to scientific scrutiny,” Steier said.

All that being said, here’s the very worst-case scenario for what could happen next with measles, according to Steier’s calculations.

It’s unclear what a nationwide outbreak would mean for the vaccinated population, says Steier.