People vaccinated against COVID-19 may be sick…See more ‍͏

Immune response: Vaccines train the immune system to recognize SARS-CoV-2 and mount a rapid defense.
Platforms: mRNA (Pfizer, Moderna), protein-based (Novavax), and adenovirus-vectored vaccines remain widely used.
Boosters: Updated formulations target newer variants like JN.1, improving protection against circulating strains.