Trump's MMR Split Would Undo Decades of Vaccine Success
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- Trump's executive order calls for splitting the measles, mumps, and rubella vaccine into separate shots, which would mean more missed doses and sick children, according to historical precedent and modeling data.
- Maurice Hilleman, a Merck scientist, developed the mumps vaccine in 1967 by swabbing his 5-year-old daughter Jeryl Lynn's throat at 1 a.m. in March 1963 after she came down with the virus, then adapted the pathogen to chick cells to weaken it for human use.
- Hilleman combined the mumps, measles, and rubella shots into the single MMR vaccine licensed in 1971, and that formulation remains the only one used in the U.S. today.
- Before the measles vaccine, the disease caused roughly 48,000 U.S. hospitalizations, 1,000 encephalitis cases, and 500 deaths annually, while the 1964–65 rubella epidemic left 20,000 infants with congenital rubella syndrome, including 11,000 born deaf.
- Japan withdrew its MMR vaccine in 1993 after a different mumps strain appeared to raise meningitis cases, and the country subsequently saw 300-plus mumps-induced hearing loss cases in 2015–16, a 2001 measles outbreak that infected an estimated 265,000 children, and a 2012 rubella epidemic.
- No single-dose measles, mumps, or rubella vaccines are currently marketed in the U.S., and a Stanford modeling study estimated that a 10% drop in MMR vaccination would produce 11 million measles cases over 25 years.
- Numerous studies have found no link between the MMR vaccine and autism spectrum disorder, and the Japan withdrawal had no effect on autism rates.
Why it matters: Trump's order targets a vaccine with 60-plus years of proven safety and the elimination of measles and rubella in the U.S., and the closest real-world analogue — Japan's post-1993 MMR withdrawal — produced deafness, a 265,000-child outbreak, and a rubella epidemic within two decades.
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