Pfizer and Moderna are getting used to readjusting their projected COVID-19 vaccine sales. Now another recalibration may be in order.
The FDA is set to authorize a third dose of their COVID-19 shots for those with weakened immune systems, NBC News reports.
The agency’s decision for immunocompromised people, who do not mount an effective response to the currently authorized two-dose regimens from Pfizer and Moderna, could be a precursor to approvals for the elderly and then for other segments of the population to receive a third dose. For these individuals, the reason to vaccinate again would be because the protection they received from the first two doses may wane over time.