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The data below describe how well vaccines work to reduce your risk. This risk reduction is in addition to protection you may have from previous infections with COVID-19 or from receiving earlier versions of COVID-19 vaccines. COVID-19 vaccines: Reduce your risk for critical illness (admission to intensive care unit or death) For adults ages 18 and older, the 2023–2024 COVID-19 vaccines reduced the risk of critical illness from COVID-19 by almost 70% in the first 2 months after vaccination. Protection decreased over time. During the 10 months after vaccination, the vaccines reduced critical illness risk by about 50%.6 Reduce your risk of being hospitalized For adults ages 18 and older, the 2023­­–2024 COVID-19 vaccines reduced the risk of COVID-19 hospitalization by about 50% in the first 2 months after vaccination. Protection decreased over time. During the 10 months after vaccination, the vaccines reduced hospitalization risk by about 30%.67 Reduce your risk of getting sick and needing to go to urgent care or the emergency department For adults ages 18 and older, the 2023–2024 COVID-19 vaccines reduced the risk of COVID-19 urgent care and emergency department visits by about 50% in the first 2 months after vaccination. Protection decreased over time, with little protection remaining at 4–6 months.67 Reduce your risk for Long COVID Studies show that people who got vaccinated against COVID-19 and later get COVID-19 are less likely to have Long COVID,