The Pfizer and Moderna COVID-19 vaccines have been shown to protect against multiple variants of the coronavirus, including delta, according to a Yale University study.
The research, published this week in the journal Nature, also found that people who were vaccinated after having COVID-19 had stronger immunity to variants than those who were vaccinated but had not had the disease.
The study was conducted during an increase in so-called breakthrough infections, mostly caused by the delta variant, in vaccinated people, according to a release.
“Vaccines induce high levels of antibodies against delta and most variants,” said Akiko Iwasaki, professor of immunobiology in the Yale School of Medicine and an author of the paper, in the release. “And two shots are better than one.”
The research also found that booster shots of Pfizer-BioNTech and Moderna, both mRNA vaccines, are effective against the coronavirus.