About 82% of the 174.5 million doses of influenza vaccine distributed across the US this season were produced in chicken eggs, according to the CDC, but the many chickens kept in secure facilities in the US won't be useful in developing a COVID-19 vaccine. Coronaviruses and influenza viruses have different receptors and other characteristics, and the novel coronavirus can't replicate inside eggs the way influenza can, says pathology professor John Nicholls.
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