An FDA Panel Decides It&039;s Time For New COVID-19 Boosters
to discuss the criteria for changing the COVID-19 vaccine and concluded that it would take into consideration the advice of the World Health Organization’s Technical Advisory Group on COVID-19 Vaccine Composition , which analyzes data on COVID-19 vaccine effectiveness and makes recommendations about when to change vaccines if that effectiveness shows signs of waning, just as a similar WHO group does for the flu vaccine each year.
The FDA committee also considered several other pieces of evidence, including the fact that currently circulating versions of SARS-CoV-2, mostly from the Omicron strain, are different enough from the original virus that the vaccines target, and that available vaccines are less effective in protecting against Omicron infections than they are in protecting against other variants.
The companies also developed and studied vaccines aimed at just the BA.1 Omicron variant, but found that combining the Omicron and original strains provided a broader immune response against more than just the Omicron strain.
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