Agents Quote by Louis Pasteur

... After it has been determined that the pathogenic organism is present in the animal body, and after it has been shown that the…

— Robert Koch

As it takes two to make a quarrel, so it takes two to make a disease, the microbe and its host.

— Charles V. Chapin

In the same way that plants will not grow on soil that lacks some substance indispensable to their growth, so microbes, these microscopic plants…

— Elie Metchnikoff

If diphtheria is a disease caused by a microorganism, it is essential that three postulates be fulfilled. The fulfilment of these postulates is necessary…

— Friedrich Loeffler

Even if it had not been possible to reproduce the disease in animals and consequently to verify the hypothesis, this simple observation would have…

— Charles Jules Henry Nicole

Time and time again, truly basic studies of simple experimental organisms have proved directly relevant to human biology and human disease. An investment in…

— H. Robert Horvitz

Like many great ideas in biology, the idea implicating infectious causation in chronic diseases, though simple, has far-reaching implications. It is so simple and…

— Paul W. Ewald

And the more profoundly the science of biology reveals the laws of the life and development of living bodies, the more effective is the…

— Trofim Lysenko

The world was sick, and the ills from which it was suffering were mainly due to the perversion of man, his inability to live…

— Brock Chisholm

Biology can be divided into the study of proximate causes, the study of the physiological sciences (broadly conceived), and into the study of ultimate…

— Ernst Mayr

Disease may be defined as "A change produced in living things in consequence of which they are no longer in harmony with their environment."

— William Thomas Councilman

Disease is a vital expression of the human organism.

— Georg Groddeck