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A preregistered systematic review in Expert Review of Vaccines found 70 vaccinated transmitters, 812 downstream cases, and one small study underneath the claim that MMR reduces onward spread.

A new peer-reviewed study by CDC, WHO, and Johns Hopkins leadership found that nearly 8 out of every 100 vaccinated people who catch measles pass it to someone else. Almost a third of them had received two doses. And the world has exactly one study, of 137 people, trying to measure how much the vaccine actually reduces onward spread.
For a generation, the public message about the measles shot has been simple. If you are vaccinated, you cannot spread it. A new study, written by the people who run the global measles elimination program, quietly says otherwise.
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Who wrote this
Not activists. Not skeptics. The paper is co-authored by the former director of the entire U.S. Immunization Program at the CDC, the CDC’s own measles laboratory chief, the head of Johns Hopkins’ vaccine access center, the recent WHO measles program lead who is now Canada’s Acting Chief Public Health Officer, the man who chairs the WHO commission that certifies whether entire regions have eliminated measles, and PAHO’s top immunization official for the Americas. One author is a paid consultant to Merck, Sanofi, Moderna, Dynavax, and Seqirus. Another runs an institute that discloses funding from vaccine manufacturers.
These are not outsiders raising doubts. The people who spent their careers building the measles elimination framework — at CDC, Johns Hopkins, PAHO, RIVM, and the WHO regional verification commissions — are the people who signed this paper.
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