The CDC has approved a fourth Covid-19 vaccine shot for adults with compromised immune systems, allowing for yet another dose amid concerns of waning immunity, as some pharma firms even hint at yearly boosters for all Americans.
Those who are “moderately and severely immunocompromised” may receive a total of four vaccine doses, including an initial two-shot inoculation, one additional dose, followed by yet another booster, the US Centers for Disease Control and Prevention (CDC) said in an updated guidance on Tuesday.
The immunocompromised were the first to receive authorization for vaccine boosters back in August, with US health agencies subsequently approving additional doses for people in other high-risk categories, such as those aged 65 and older and adults more likely to be exposed to the virus.
However, for the immunocompromised, the CDC classifies a third shot as an “additional dose,” which uses the same amount of vaccine as the previous two, while the fourth jab approved on Tuesday is defined as a “booster” proper. The fourth dose uses only half the volume of the others.