A "Saline Placebo" was never used in the Salk vaccine trial. The below page is from the official final report for the Salk trial that expressly explains what the control group received in that trial. It was an injection that included, among other things, the following ingredients: “199 solution” (a synthetic tissue culture medium and ethanol), “phenol red,” “antibiotics,” and “formalin.” (Don’t take my word for it, see the full report for yourself: babel.hathitrust.org/cgi/pt?…) Also note that FDA, in its guidance regarding placebo trials, states: “Placebos, defined as inert substances with no pharmacologic activity…” and that a “placebo control … group ... receives an inert treatment…” Or as CDC explains: “A substance or treatment that has no effect on living beings.” For source links and more see aaronsiri.substack.com/p/fac… and aaronsiri.substack.com/p/no-…