Trump's vaccine plan would require millions of individual shots last used decades ago

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Public health experts have been quick to condemn an executive order from President Donald Trump aimed at upending childhood vaccinations in the U.S., but the biggest obstacles may be the unprecedented financial and logistical challenges it would impose on parents, health providers and drugmakers.

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To accomplish that, drugmakers would need to revive a slate of individual vaccines that have not been marketed separately in the U.S. for decades. They would also have to build new manufacturing plants capable of producing millions more vaccine doses than the nation currently uses.

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Currently, there are no individual vaccines in the U.S. for measles, mumps or rubella. All the vaccines approved for those viruses by the Food and Drug Administration are combination shots. That three-in-one approach has been the standard in the U.S. since the early 1970s.

Dr. Jesse Goodman, a former FDA vaccine chief, said companies would have to conduct large studies showing new individual shots produced immune system-boosting reactions in children similar to the current versions.

Companies might also have to demonstrate the safety of new manufacturing facilities and procedures, given that individual measles shots haven't been widely produced in the U.S. for roughly a half-century.

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