Why do we need a 3rd dose of the COVID-19 vaccine?

The COVID-19 vaccines have been incredibly effective at keeping people out of the hospital. So why do we need a third dose? Let's connect the dots. Boosters are pretty common when it comes to vaccines. For example, tetanus shots require a booster every 10 years. That's because, over time, the immunity you get from some vaccines starts to wear off. READ MORE: https://www.wcnc.com/article/news/hea...