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Coronavirus Fourth Wave: A COVID booster shot is an additional dose or doses of a vaccine given after the protection provided by the original shot(s) has begun to decrease over time. The booster helps people maintain strong protection from severe coronavirus disease. The development of vaccines against COVID-19 has played a big role in helping reduce the number of new COVID-19 cases. But the time is approaching when a first dose isn't enough anymore. Booster shots are common with many vaccines and can help your immune system develop added protection against a virus.
According to the Centers for Disease Control and Prevention (CDC), almost 82 percent of people ages 5 and up in the United States have received at least one dose of a COVID-19 vaccine, and nearly 66 percent of the total U.S. population is fully vaccinated. But only about half of eligible people have received a booster dose.