The FDA has expanded the emergency use authorization of the Pfizer and Moderna Covid-19 vaccines to allow adults age 50 and older to get a second booster as early as four months after their first booster dose of any Covid-19 vaccine. (via CNN)
The move extends the availability of additional boosters to healthy older adults. The FDA had previously allowed second booster shots for anyone 12 years of age or older who was severely immune deficient, starting four months after their first booster."Current evidence suggests some waning of protection over time against serious outcomes from COVID-19 in older and immunocompromised individuals.
A smaller study of health care workers, which included younger adults, found that fourth boosters were safe and restored antibodies to the same levels reached after third doses. But fourth doses were only moderately effective -- about 30 to 40% -- at preventing illness. And most of the workers who got sick still had high viral loads, suggested that they were capable of transmitting the infection to others.
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