The U.S. Centers for Disease Control and Prevention (CDC) altered its definition of COVID-19 cases among the vaccinated, leading to a lower number of cases classified as a breakthrough, according to documents obtained by The Epoch Times.
The CDC in early 2021 defined the post-vaccination cases as people testing positive seven or more days after receipt of a primary vaccination series, according to one of the documents.
The definition was changed on Feb. 2, 2021, to only include cases detected at least 14 days after a primary series, another document shows.
“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….