evidence: For 2024-2025, FDA has approved and authorized two mRNA COVID-19 vaccines, (Moderna and Pfizer COVID-19 vaccines) and one protein subunit COVID-19 vaccine (Novavax COVID-19 vaccine). For more information about doses, view COVID-19 vaccine recommendations from CDC. [...] Vaccines teach our immune system how to fight against a specific virus. Like other viruses, COVID-19 changes over time, leading to new variants. Updated vaccines provide protection against these variants. By staying up to date with recommended COVID-19 vaccine doses, you can greatly reduce your risk of severe illness, hospitalization, and death. [...] For more vaccine safety information, visit COVID-19 vaccine resources from the Centers for Disease Control and Prevention (CDC):