The 5 unique samples Dr. Fleming tested can hardly be considered definitive proof that there were no parasites in any of the millions of samples he did not test. That could only be inferred if there was careful quality control by the manufacturer and every bottle was known to be equal. Even Dr. Fleming's own conclusions show there was a lot of miscellaneous "garbage" in them. Given poor quality control, either by accident or intent, there is nothing he says in his report that would conflict with the idea that other samples he did not test may have hosted parasites.