People who became infected with Covid-19 after getting a messenger RNA vaccine carried less virus and had shorter cases than unvaccinated people who became infected, a study by government health researchers found.

Sixteen people in the study who got infected, despite taking a Pfizer Inc. 
PFE,
+0.15%

or Moderna Inc. 
MRNA,
+0.22%

vaccine, had on average 40% less virus in their nose compared with the 155 unvaccinated people who became sick, according to the study, published online Wednesday in the New England Journal of Medicine.



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