How long does immunity last after receiving the COVID vaccine? Do I need a third dose?

DETROIT – Since the coronavirus pandemic began, Dr. Frank McGeorge has kept viewers updated and informed on all fronts. He has been answering your questions about the vaccine, the vaccination process, and more.

READ: More answers to questions about coronavirus

If I make a copy of the COVID-19 vaccination record card to keep as a backup in case I lose the original, will it be accepted as proof of vaccination? Will I need to get a new proof of vaccination card?

A copy is a good idea, but keep in mind that the purpose of the vaccination card is to remind people which vaccination they received and when. It is not considered an official document for anything other than a casual proof of vaccination.

As a heavy man, should I get a third dose to make sure I have an adequate amount of vaccine in my blood?

No. There is no dose adjustment and no additional doses are recommended if someone is above their ideal body weight.


I had COVID from December to January. Very mild case. A coworker recently contracted COVID. Can I get it again? Or could you wear it to infect others?

For infected people, studies estimate that they must remain immune for at least three months.

My daughter said there is a study reporting that COVID-19 vaccine injections only provide 6 month immunity. Is that information true?

No. We do not know how long the protective immunity from vaccines will last. That’s mainly because the vaccines only began their larger-scale trials late last year. Long-term efficacy data is still being collected.

Why is the second shot more likely to cause a reaction than the first shot? Is it more powerful or is it made differently?

The second dose of the vaccine is the same as the first. The reason more people react to the second injection is that their immune system was activated with the first dose. This is how your immune system works. Generally, the response to the second exposure is expected to be better.


I had COVID-19 and I recovered. How long do I have to wait to get the vaccine? They told me 90 days, but recently I read online that they say 6 months. How long I wait?

The reason for the wait is that, while the vaccine was in short supply, people who had a recent infection are already protected for at least 90 days and could wait to get vaccinated. Once the vaccine becomes more available, it does not need to be postponed.

Is the emergency use authorization the same as the FDA approval? If not, when will the vaccines be approved by the FDA?

An emergency use authorization is not the same as a full approval. The EUA is only valid while a public health emergency is in effect. After that, the vaccines will require full approval, which requires some additional data. The most important piece will be a longer-term follow-up.

My daughter got an appointment at Ford Field for the vaccine. He will be in Florida at the time of the second shot and will be home four days later. I know you said four days early is fine, how about four days late?


They are accepted four days before or four days late. The CDC said the second injection can be given up to six weeks after the first, although that’s not ideal.

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