WI38 Human Diploid Lung Fibroblasts
The CDC Request:
The updated 2019 CDC vaccine excipient list has removed WI-38 human diploid lung fibroblasts from the "contains" column, where it was previously 2018 (and back) implying it has been removed. I am looking for the clinical study records/information supporting the removal of WI-38 human diploid lung fibroblasts from the vaccines (ex. MMR II and MMR Proquad). Which would suggest new studies have been done to support the safety of the removal and function of said vaccines. And if not removed, why were the WI38 fibroblasts taken off the excipient list?
The Response:
The CDC searched through their records and came up with nothing regarding studies of removal of the WI-38 human diploid lung fibroblasts.
The National Center for Immunization and Respiratory Diseases came up with nothing.
The Immunization Safety Office, also coming up with nothing.
The FDA:
Since the CDC pointed this request in the direction with the FDA, I made the exact same request with the FDA and included the letter provided from the CDC.
I spoke with FDA's Suzann Burk on the phone, and she confirmed to me that the WI-38 human diploid lung fibroblasts were still infact in the vaccines. The FDA then sent me this letter below, along with the attached MMR inserts they have on file showing the presence of WI-38 human diploid lung fibroblasts.
MMRII - top of 1st page
ProQuad - under "Description" page 15 or 16 (depending on device.)