Do the Covid vaccines provide long-lasting protection?

The Centers for Disease Control and Prevention has recommended that high-risk adults receive a second updated Covid vaccine to enhance their protection against the virus. This recommendation specifically applies to individuals aged 65 and older and those with weakened immune systems. The mRNA vaccines from Pfizer and Moderna have been shown to be effective in inducing immunity to the virus. However, concerns about waning vaccine immunity, especially in older adults, have led to the recommendation for additional doses. The rapidly changing nature of the virus necessitates ongoing monitoring and potential updates to the vaccines to ensure continued protection. While frequent boosters may not be needed for other viruses like measles, the unique characteristics of Covid-19 require a different approach to maintaining immunity.