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The third dose is given 28 days after the second dose.

The booster shot is a little different. It will be given at least six months after a person’s second dose. Why six months?

“We anticipate that those immunity levels may start to drop or wane off over time and so we want to give you a booster now to bump those levels up to as high as we can get them,” Amy Carter explains.

https://www.abc4.com/news/local-news/do-...fferences/