He'll keep for another three hours without a booster shot.

Those who have already had their booster shot do not need another.

Studies are under way to see how long the vaccine will last and if a booster shot is needed.

We need someone to come in and give us a booster shot.

The booster shots are then given between 4 and 6 years of age.

The booster shots are sometimes given 1 month and 6 months after the first shot.

But the booster shot was not enough to keep a rally going.

This is a bit like getting an airborne booster shot.

The booster shots are usually given 7 days and 2 weeks to 1 month after the first shot.

If a booster shot is needed later, that could mean another $120.