Moderna vaccine available for individuals 18 years and older. Second dose Moderna should be given at 28 days after first shot, but may be given as early as 24 days. Immunocompromised individuals should consult their doctor to confirm their eligibility for a third dose. Third dose for immunocompromised should not be given earlier than 28 days after the second dose. Booster dose for 65 and over or high risk populations should be given no earlier than 6 months after second dose