Defenders of germ “theory” dismiss Koch’s first postulate—that a microbe should be found only in the sick, not the healthy—as “outdated” because of asymptomatic carriers. But that excuse turns a criterion meant to falsify the germ hypothesis into an unfalsifiable belief.
Logically, Koch knew that correlation didn’t equal causation. But when he found the TB and cholera bacteria in healthy people, his postulates failed. Instead of abandoning the hypothesis, he invented the “asymptomatic carrier” to save it. That’s when science became pseudoscience.
“Asymptomatic carriers” don’t disprove the first postulate—they prove it worked. Finding the “cause” in the healthy means it was never the cause at all. When falsification is rebranded as exception, science becomes belief.