(CBS DETROIT) – CVS and Walgreens are getting on board to help those with weakened immune systems.

Both pharmacies are now taking appointments for a third booster shot.

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Those eligible are asked to bring their vaccination card.

A third booster shot can only be given at least four weeks after getting the second dose and should be the same brand as previous shots.

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Walgreens says they are offering walk-in appointments for the third shot.

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