HomeNewsWorldCOVID-19 vaccine: US CDC expands booster rollout, allows mixing of Pfizer-Moderna-J&J shots

COVID-19 vaccine: US CDC expands booster rollout, allows mixing of Pfizer-Moderna-J&J shots

While those who received first shot of Pfizer were already eligible for booster, Moderna and J&J recipients can now also choose which vaccine they want for their booster shot

October 22, 2021 / 09:30 IST
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Representative image.
Representative image.

Millions more Americans can get a COVID-19 booster and choose a different company’s vaccine for that next shot, federal health officials said Thursday.

Certain people who received Pfizer vaccinations months ago already are eligible for a booster and now the Centers for Disease Control and Prevention says specific Moderna and Johnson & Johnson recipients qualify, too. And in a bigger change, the agency is allowing the flexibility of “mixing and matching" that extra dose regardless of which type people received first.

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The Food and Drug Administration had already authorized such an expansion of the nation's booster campaign on Wednesday, and it was also endorsed Thursday by a CDC advisory panel. CDC Director Dr. Rochelle Walensky had the final word on who gets the extra doses.

“These past 20 months have taught us many things, but mostly to have humility," she told the panel. "We are constantly learning about this virus, growing the evidence base and accumulating more data.”

COVID-19 Vaccine
Frequently Asked Questions

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How does a vaccine work?

A vaccine works by mimicking a natural infection. A vaccine not only induces immune response to protect people from any future COVID-19 infection, but also helps quickly build herd immunity to put an end to the pandemic. Herd immunity occurs when a sufficient percentage of a population becomes immune to a disease, making the spread of disease from person to person unlikely. The good news is that SARS-CoV-2 virus has been fairly stable, which increases the viability of a vaccine.

How many types of vaccines are there?

There are broadly four types of vaccine — one, a vaccine based on the whole virus (this could be either inactivated, or an attenuated [weakened] virus vaccine); two, a non-replicating viral vector vaccine that uses a benign virus as vector that carries the antigen of SARS-CoV; three, nucleic-acid vaccines that have genetic material like DNA and RNA of antigens like spike protein given to a person, helping human cells decode genetic material and produce the vaccine; and four, protein subunit vaccine wherein the recombinant proteins of SARS-COV-2 along with an adjuvant (booster) is given as a vaccine.

What does it take to develop a vaccine of this kind?

Vaccine development is a long, complex process. Unlike drugs that are given to people with a diseased, vaccines are given to healthy people and also vulnerable sections such as children, pregnant women and the elderly. So rigorous tests are compulsory. History says that the fastest time it took to develop a vaccine is five years, but it usually takes double or sometimes triple that time.
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