Covid-19 vaccines produced by Pfizer and BioNTech and Moderna are likely to be released later this month. Along with the excitement that this could be the beginning of the end of the pandemic, comes concerns about the safety of the vaccine. Just how safe is the covid vaccine? How does it work compared to other vaccines? And with nearly half of U.S. adults saying as recently as this fall that they don’t intend to be inoculated, what happens to people who don’t get the vaccine? The Trib put these questions to Pittsburgh based infectious disease and critical care physician Dr. Amesh Adalja, a senior scholar at the Johns Hopkins Center for Health Security.