The second shot is recommended three weeks after the first Pfizer-BioNTech shot or four weeks after the first Moderna shot. Second doses were considered missed if more than 42 days had passed since the initial jab.
Health officials have explained that people — in this case, nearly 15 million people — skip their second shots for a variety of reasons, such as mistakenly believing that they only need one dose to be protected. Some people also want to avoid the sometimes-unpleasant side effects that come with the second dose, and others simply miss their second appointment and can’t or don’t reschedule.
David Broniatowski, associate director for George Washington University’s Institute for Data, Democracy & Politics, said some people also mistakenly think if they’ve already had covid-19, they just need one dose.
Public health officials also discussed whether one injection could be enough earlier in the pandemic, theorizing that some immunity is better than none, which Broniatowski said might have led to confusion on whether two doses are really needed.
“When you have those sorts of things, people start to rationalize, ‘Well, maybe it is not necessary to get that second dose,’ especially when they have other barriers or other concerns,” he said.
Regardless of whether you’re busy or want to avoid feeling under the weather, experts say completing vaccination will be crucial as the highly transmissible delta variant continues its spread.
A United Kingdom study published in May found that the Pfizer vaccine was just 33 percent effective against the variant in preventing symptomatic disease after one dose. After two shots, that number jumped to 88 percent.
“It’s clear how important the second dose is to secure the strongest possible protection against COVID-19 and its variants — and I urge everyone to book in their jab when offered,” former U.K. health and social care secretary Matt Hancock said in a news release about the study.
People who miss the optimal window for their second dose don’t need to start over, according to the CDC. There’s just less data on how effective the second dose is if administered more than 42 days after the first.
Broniatowski said it’s important for health officials to investigate why people aren’t getting second doses and shift their public messaging as needed to address what they find. He said this will be critical if coronavirus booster shots end up being necessary.
“If the science ends up being that we need booster shots, then we’re going to need to figure out, ‘How do we communicate that?’ ” he said. “I think we can learn a lot right now from looking at the reasons why people who don’t follow up are not following up.”
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15 million people in the U.S. have missed their second dose of the coronavirus vaccine, CDC says - The Washington Post
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