The U.S. Food and Drug Administration (FDA) has approved the Spikevax (Moderna) COVID-19 vaccine in all people 18 and older, and an Emergency Use Authorization (EUA) for people 6 months to 17 years old for the Moderna vaccine. You should not get the vaccine (shot) if you have a history of allergic reaction to any ingredients of the vaccine, to polysorbate, or to polyethylene glycol (PEG).