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Germ Theory of Disease

The foundational axiom stating that specific microorganisms (pathogens) are the primary cause of infectious diseases, necessitating their elimination or neutralization during surgical procedures.
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The statement of the theorem

Let PP be the set of pathogenic microorganisms and DD be the state of disease. Define the causal relationship C(P→D)C(P \rightarrow D) such that the probability of disease occurrence, P(D∣P)P(D|P), is non-zero if and only if the concentration of viable pathogens, NP(t)N_P(t), exceeds a critical threshold NcritN_{crit}, i.e., P(D∣NP(t))=1P(D|N_P(t)) = 1 if NP(t)>NcritN_P(t) > N_{crit}, and P(D∣NP(t))=0P(D|N_P(t)) = 0 if NP(t)=0N_P(t) = 0.