The fine print: Understanding the new policy authorizing extra Covid vaccine doses for the immunocompromised
This much is clear: Some people in the United States with medical conditions that have compromised their immune systems are now eligible for a third dose of Covid-19 vaccine.
But the new policy from U.S. health officials, announced late last week, came together in a hurry. It addresses some questions but leaves a number unanswered, in some cases because there are no data on which to base a decision.
