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Perhaps the most pressing issue under active consideration by the FDA and CDC concerns the possible need for COVID-19 vaccine booster doses. Five new or continuing studies provide key information that is influencing the decisions of both agencies.
In two CDC-based studies with test-negative designs, researchers assessed the effectiveness of the three COVID-19 vaccines currently authorized in the U.S.
Thompson and colleagues evaluated outcomes in adults aged ≥50 arising from >41,500 hospital admissions to 187 hospitals and >21,500 emergency department and urgent care visits to 221 facilities between January 1 and June 22, 2021. The effectiveness of full immunization with mRNA vaccine (Pfizer-BioNTech or Moderna) was 89% (RT-PCR–confirmed SARS-…