Is virulence only in the germ?
Honigsbaum shows René Dubos attacking the germ-theory idea that virulence belongs to microbes alone, stressing host physiology, soil-like environments, and incomplete BCG protection.
Source
René Dubos, tuberculosis, and the "ecological facets of virulence"
What they did
The paper follows Dubos from soil chemistry and the SIII enzyme to tuberculosis: sequestered bacilli in granulomas, recrudescence when resistance ebbs, BCG’s incomplete shield, and the claim that pathogens cause symptoms through disturbance of the host’s normal processes.
What they found
Virulence is not a property of microbes alone. Host resistance and environment matter. BCG cannot be complete while immunity-regulating components of the bacillus remain mysterious. Dubos’s soil insight later framed his disease ecology.
The limits
What it doesn't show
This is HPLS, not a new microbiology experiment. It does not re-measure BCG efficacy.
Key terms
- Virulence-as-microbe
- The germ-theory idea Dubos rejected: virulence as a property of microbes alone.
- Ecological virulence
- Pathogenicity as a relation among microbe, host physiology, and environment.
- Granuloma recrudescence
- Virulent bacilli sequestered after primary TB, flaring if resistance ebbs.
- BCG limit
- Dubos’s worry that vaccination cannot fully protect while immunity components stay mysterious.
Flashcards
Research intelligence for this paper
See its role on concept claims, tensions it is part of, placement history, and related discoveries.
Quiz yourself
Dubos denied that virulence is?
Common questions
What germ-theory idea did he target?
That virulence is a property of microbes alone.
How do pathogens cause symptoms, for Dubos?
Through disturbance of the host’s normal physiological processes.
Why isn’t BCG enough?
Protection cannot be complete while the bacillus’s immunity-regulating components remain mysterious.
More on Philosophy of science