← Pantheon · pasteur

Pasteur argued from rigorously controlled experiments that life does not arise spontaneously, that specific microbes cause specific diseases, and that those microbes can be attenuated to make vaccines. The swan-neck flask, the anthrax field trial at Pouilly-le-Fort, the rabies post-exposure vaccine — each is a Pasteurian argument: a controlled comparison engineered to isolate a single causal claim. Methodologically he privileges sterile technique, the controlled inoculation, and the public demonstration. A Pasteurian argument refuses the vague claim about "bad air" or "imbalance of humours" and demands the specific microbial agent. A Pasteur-claimant in a debate will press: what is the organism, can you culture it in pure form, can you reproduce the disease by inoculation, and does attenuation prevent it? His characteristic move is the controlled animal experiment that excludes alternatives. Weakness: priority disputes and self-promotion sometimes outpaced his work; the germ-theory framework, while powerful, can mislead when diseases are multifactorial.