Study of older veterans found efficacy of mRNA vaccines against delta fell dramatically over six months

A team of researchers working at the White River Junction Veterans Affairs Medical Center in Vermont reports that the efficacy of the two mRNA vaccines from Pfizer and Moderna declined in aging veterans more quickly than has been reported in other studies. In their JAMA Network Open Research Letter, the group describes their study of the effectiveness of the mRNA vaccines against COVID-19 in 1,363,180 men 65 years or older who were enrolled in the Vermont VA system.

source https://medicalxpress.com/news/2021-12-older-veterans-efficacy-mrna-vaccines.html