Animal Quote by Robert Koch

To demonstrate experimentally that a microscopic organism actually is the cause of a disease and the agent of contagion, I know no other way,…

— Louis Pasteur

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

“Koch’s postulates here: The same pathogen must be present in every case of a disease. The pathogen must be isolated from the diseased host…

— Anne E. Maczulak

Scientific physiology has the task of determining the functions of the animal body and deriving them as a necessary consequence from its elementary conditions.

— Carl Ludwig

“A dying organism is often observed to be capable of extraordinary endurance and strength. ... When any living organism is attacked, its whole function…

— John Steinbeck

Reproduction is so primitive and fundamental a function of vital organisms that the mechanism by which it is assured is highly complex and not…

— Havelock Ellis

In microbiology the roles of mutation and selection in evolution are coming to be better understood through the use of bacterial cultures of mutant…

— Edward Lawrie Tatum

Biologically the species is the accumulation of the experiments of all its successful individuals since the beginning.

— H. G. Wells

Perhaps bacteria may tentatively be regarded as biochemical experiments; owing to their relatively small size and rapid growth, variations must arise much more frequently…

— Marjory Stephenson

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

The need to deal with pathogens has driven the evolution of the vertebrate immune system, so it should not be surprising that experiments with…

— Peter C. Doherty