(BCN) - Nearly 4,000 Kaiser patients may have received slightly less than the recommended dose of their COVID-19 vaccination last fall at Kaiser Permanente's Walnut Creek Medical Center, the health care provider said Monday.
Kaiser is now contacting about 3,900 people who received a Pfizer-BioNTech COVID-19 vaccine dose between October 25 and December 10.
According to Kaiser, patients may have received between 0.01 and 0.04 milliliters less than the recommended dose of 0.30 milliliters.
Kaiser and medical experts from the US Centers for Disease Control and Prevention noted that the difference between the administered dose and the recommended dose is negligible and is unlikely to result in reduced COVID protection.
Kaiser said, however, that it offers an extra dose of Pfizer vaccine to the affected patients if they request one.
According to the health nurse, the reduced dose size was a result of incorrect communication between staff and was an isolated incident.
"We took immediate steps to confirm that the problem was isolated and we retrained the staff immediately and validated their understanding of the correct procedure," Kaiser said. "We are constantly monitoring so it does not happen again."
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