mRNA-1273 (Moderna) COVID-19 vaccine is derived from mRNA method of technology. It is a nucleoside-modified messenger RNA (modRNA) vaccine. mRNA-1273 (Moderna) COVID-19 vaccine contains S-2P antigen. Dose series = 2 doses, both doses have difference of 28 days Vaccine efficacy = 92% Safety concerns = Apossibility of severe allergic reaction (if it occurs after first dose, don’t take second dose)