People with weakened immune systems are now advised to get four shots of a COVID-19 vaccine in a time period that may be as short as 140 days. The updated recommendation from The Centers for Disease Control and Prevention (CDC) has people who are moderately or severely immunocompromised get a primary series of Moderna or Pfizer’s COVID-19 vaccine and an additional dose as early as 28 days after the second dose. The second booster shot is now recommended as soon as three months after the third dose. If a person with a weakened immune system follows the advised vaccination schedule closely, they would end up with four shots of the Pfizer or Moderna vaccines in less than six months. For recipients in the population who received the single-shot Johnson & Johnson COVID-19 vaccine, the updated guidance says they should get a second dose at least 28 days after their vaccination, …
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