Staying Up to Date with COVID-19 Vaccines | Covid | CDC Importance of staying up to date Getting the 2025–2026 COVID-19 vaccine is important because: Protection from the COVID-19 vaccine decreases with time Immunity after COVID-19 infection decreases with time COVID-19 vaccines are updated to give you the best protection from the currently circulating strains Getting the 2025–2026 COVID-19 vaccine is especially important if you: Never
Vaccine Booster Shots: What to Know - WebMD For most vaccinations, you need more than one shot for the best protection against disease Learn more about vaccine boosters and why you need them
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What Is a Booster Shot? How It Works and Who Needs It A booster shot is an additional dose of a vaccine given after your initial vaccination to restore or strengthen immunity that has faded over time Your immune system builds defenses after the first round of shots, but those defenses naturally weaken, sometimes within months A booster reactivates your body’s immune memory, bringing protection back up and often making it broader than before
What Is a Booster Shot and How Does It Work? - Biology Insights Determining Booster Schedules Public health agencies determine the timing of booster shots by balancing two main drivers: the rate of the body’s natural immunological decline and the level of risk within the population The first factor is endogenous waning, which measures how quickly antibody levels drop below a protective threshold
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What Is a Booster Shot and How Does It Work? - ScienceInsights A booster shot is an additional dose of a vaccine given after your initial series, designed to restore protection that has naturally faded over time Your immune system’s memory of a virus or bacteria weakens as months and years pass, and a booster essentially reminds it how to fight back