Health experts answer questions about the COVID-19 vaccine’s potential side effects, immunity, passing the virus to others and more. Sign up for COVID-19 text alerts at newsday.com/text. Panelists include Miguel A. Saldivar, MD, Clinical Assistant Professor of Medicine, Division of Infectious Diseases, Stony Brook Medicine; and Dr. Bruce Polsky, Chairman of Medicine at NYU Langone Hospital-Long Island.