On Thursday of this week, vaccine advisors to the Food and Drug Administration voted unanimously to approve emergency authorization of a third booster shot of the Moderna vaccine. The approved booster vaccine is half the dosage of the first 100 microgram dose given to individuals. The committee recommended that those who had taken the Moderna vaccine receive their third dose six months after their second. However, the group did note the approval was specifically for groups at higher risk, ie those 65 years or older and those who are immunocompromised. This comes after the same group approved the use of a third booster dose of the Pzifer vaccine. Just one day after they also approved the use of the Johnson and Johnson vaccine, although some public health officials argue that those who received a single dose of the Johnson and Johnson vaccine may benefit from a booster of the Moderna or Pfizer vaccine. Read more about the approval process for all three vaccines here and here.