Germ Theory

1. Germ Theory

2. Thomas Wakley ...all is darkness and confusion, vague theory, and a vain speculation.  Is it a fungus, an insect, a miasm, an electrical disturbance, a deficiency of ozone, a morbid off-scouring from the intestinal canal?  We know nothing; we are at sea in a whirlpool of conjecture.

3. Miasma Theory

4. Blood Generation Theory

5. Germ Theorycontagiumvivum

6. Friedrich Henle The material of contagions is not only an organic but a living one and is indeed endowed with a life of its own, which is, in relation to the diseased body, a parasitic organism.

7. John Snow

8. Louis Pasteur (1822-95)

9. Robert Koch(1843-1910)

10. anthrax spores

11. Koch's postulates • the pathogen must be found in every individual who has the disease. • the pathogen must be isolated from a diseased individual and grown separately in a pure culture. • the disease must be induced in an experimental animal by transferring the pathogen from the pure culture. • the same pathogen must be isolated from the experimental animal after it has contracted the disease.