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How Long Do COVID-19 Vaccines Provide Immunity?

By Sumathi Reddy, The Wall Street Journal


How Long Do Covid-19 Vaccines Provide Immunity?

Pfizer, Moderna and Johnson & Johnson vaccines provide good protection against the virus that causes Covid. But how long does that last? Will you need a booster shot? Here’s what we know.


Recent data from Pfizer, the manufacturer of one of the three vaccines available in the United States, indicates that protection lasts at least six months.


The results showed minimal antibody decline. Recipients of the Moderna vaccine also had robust levels of antibodies more than six months later, according to a recent study published in the New England Journal of Medicine.


Some people have incorrectly concluded that means that those vaccines offer only six months of protection, says Scott Hensley, a professor of microbiology at the University of Pennsylvania. “That’s false,” says Dr. Hensley. “We only have six months of data...Six months from now it’s likely we’ll learn we have one year of protection.”


How Long Do Covid-19 Vaccines Provide Immunity?

Pfizer, Moderna and Johnson & Johnson vaccines provide good protection against the virus that causes Covid. But how long does that last? Will you need a booster shot? Here’s what we know.


How long does protection from Covid vaccines last? It’s a question that’s becoming more important as some of the first people to be vaccinated approach four months post-inoculation.


The short answer is: We don’t fully know yet. But more data is coming in that provides clues. Here’s what we know so far.


How long are we protected from getting Covid-19? Does the efficacy decline over time?


Recent data from Pfizer , the manufacturer of one of the three vaccines available in the U.S., indicates that protection lasts at least six months. The results showed minimal antibody decline. Recipients of the Moderna vaccine also had robust levels of antibodies more than six months later, according to a recent study published in NEJM.


How does protection provided by these vaccines work?

The vaccines will likely provide at least some degree of protection for a long time because there are so many layers of immunity, says Deepta Bhattacharya, an associate professor of immunobiology at the University of Arizona in Tucson.


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