10/20/2023 0 Comments What is a booster shot![]() For example, the flu vaccine needs a booster every year, and the diphtheria and tetanus vaccine every 10 years.īoosters are often identical to the original vaccine. ![]() They are commonly used to bolster many vaccines because immunity can wear off over time. What is a booster shot?īoosters are an extra dose of a vaccine given to maintain vaccine-induced protection against a disease. Here, microbiology and infectious disease specialist William Petri of the University of Virginia answers some common questions about COVID-19 booster shots. ![]() The increasing prevalence of new coronavirus variants is raising questions about how well protected those who’ve already had their COVID-19 shots are against evolving forms of the SARS-CoV-2 virus.
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