More than 6,000 people who were vaccinated at the Oakland Coliseum mass vaccination site on Feb. 28 and March 1 received less than the recommended dose of Pfizer’s Covid-19 vaccine, in what the California Department of Public Health (CDPH) calls “the result of human error.”
The Oakland Coliseum site is the nation’s first mass vaccination location as part of a federal/state partnership to boost vaccine administration. People who were vaccinated after 4 p.m. on Feb. 28 and before 3 p.m. on March 1 may have been given just 0.22 ml of the Pfizer vaccine, which is recommended to be given at 0.3ml per dose, state health officials said.
About 6,300 people had appointments at the mass vaccination site during that time frame and could have received the smaller dose.
“The CDC has determined that any dosage of 0.15 ml or larger is safe and does not require the dose to be repeated to protect people against Covid-19,” CDPH spokesperson Ali Bay said in a statement to CNN.
The agency believes the vast majority of those affected were receiving their first dose of the vaccine, given this was a newly-opened site.
Each person who may have received the lower than recommended dose is being notified by a letter from CDPH, and is urged to complete their vaccination series as usual.
The error was corrected by on-site staff on the afternoon of March 1, according to CDPH, and additional training and quality assurance steps have been implemented as a preventative measure.
Reached by CNN, California’s Office of Emergency Management deferred comment to CDPH. The Federal Emergency Management Agency (FEMA) did not comment.