For the immunocompromised, the initial vaccination is three doses. They have been allowed since last fall to get a first booster, or fourth dose, and are now entitled to a fifth, CDC spokeswoman Kristen Nordlund confirmed.
People who received initial doses of the Johnson & Johnson vaccine can receive a second booster dose, Nordlund said. The J&J vaccine was initially a one-shot vaccine, though studies suggested that two doses were needed to provide the same protection as the other two authorized vaccines.
