Vaccine manufacturers use different growth media on which to manufacture the vaccines. They do not report, and I believe are not required to report, the exact ingredients in all of the growth media. Therefore, we may not know whether peanut antigen is used in the vaccine manufacturing process just by reading through the package inserts. Our lack of knowledge about it does not mean it isn’t knowledge waiting to be discovered. And, it may, or may not, have anything to do with an attempt to purposely hide the information that peanut antigen is present in vaccines.