(As you recall, thimerosal did not prevent the occurrence of abscesses following DTP vaccine from multi dose vials.) At the time Dr. Halsey wasn’t even considering the advantage of unicode vials if thimerosal is removed. Bill Egan has checked with mark Raza on whether the FDA is compelled to follow USP standards for preservation and … Continue reading FDA Email Regarding Thimerosal Ineffectiveness and USP Guideline Not Necessary to Follow