"We have revised the case definition," Dr. Marc Fisher, the lead of the CDC's Vaccine Breakthrough Case Investigation Team, wrote to colleagues at the time.
"Rather than playing games with the definition of breakthrough cases," Dr. Bhattacharya told The Epoch Times in an email, the CDC should have warned "Recently vaccinated vulnerable older people that they were at higher risk for being infected during that period."
The CDC excluded some postvaccination cases because they did not meet the updated definition, the documents show, providing an inflated view of vaccine effectiveness.
A CDC official said it was a "Possible breakthrough case," but the case would not have been counted under the earlier or later breakthrough definition.
CDC officials discussed breakthrough cases sporadically in public settings, but also made false claims about vaccine effectiveness, including claiming in March 2021 that vaccinated people did not get sick.
The breakthrough case definition was revised after multiple CDC officials emailed about the vaccines failing to prevent infection.
Dr. Fisher said in one missive on Dec. 21, 2020, that he was directed by a superior "To start working on a protocol to evaluate COVID vaccine failures or breakthrough cases."
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