The currently approved Covid-19 vaccines may need an update to ensure a high level of protection as the virus continues to evolve, according to the Food and Drug Administration.
The FDA proposed using the process for updating flu vaccines as a guide to how Covid vaccines could be modified in the future. The World Health Organization meets twice a year to analyze the circulating flu variants and makes a recommendation on the composition of the vaccine.
However, the FDA said in its briefing document that it may need to consider updating the Covid vaccines without a prior WHO recommendation. It's unclear if the spread of Covid will follow a pattern that would make a global recommendation on vaccine updates possible, the FDA said in the document.
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