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What is known about a possible 4th Pfizer vaccine shot?

2022-07-19 23:00:02
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What is known about a possible 4th Pfizer vaccine shot?

March 15, 2022 -- The CEO of vaccine maker Pfizer made news over the weekend when he said people who have already gotten three shots of his company's COVID-19 vaccine will need a fourth dose. Albert Bourla, PhD, said data the company has submitted to the FDA -- but has not yet released publicly -- shows this need.

Is a COVID-19 vaccine booster necessary?

An additional primary shot of a COVID-19 vaccine is recommended for people who are vaccinated and might not have had a strong enough immune response. In contrast, a booster dose is recommended for people who are vaccinated and whose immune response weakened over time.

Is it normal to have side effects after second COVID-19 vaccine?

Side effects after your second shot may be more intense than the ones you experienced after your first shot. These side effects are normal signs that your body is building protection and should go away within a few days.

What is a vaccine booster?

A booster shot is an additional dose of a vaccine needed to “boost” your immunity. This will give you better protection from disease. Many routine vaccines require more than one shot to achieve immunity. For example, the MMR (measles, mumps, rubella) vaccine requires two shots.

How long do COVID-19 antibodies last?

At this time, it is unknown for how long antibodies persist following infection and if the presence of antibodies confers protective immunity.