The pure culture is the foundation for all research on infectious disease.

- Robert Koch

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

- Robert Koch

In view of the epidemiological situation in Germany, the lack of evidence for the effectiveness of the BCG-vaccine and the not uncommen severe, undes…

- Robert Koch

If my efforts have led to greater success than usual, this is due, I believe, to the fact that during my wanderings in the field of medicine, I have …

- Robert Koch

However, on many occasions, I examined normal blood and normal tissues and there was no possibility of overlooking bacteria or confusing them with gr…

- Robert Koch

To prove that tuberculosis is caused by the invasion of bacilli, and that it is a parasitic disease primarily caused by the growth and multiplication…

- Robert Koch

From my numerous observations, I conclude that these tubercle bacilli occur in all tuberculous disorders, and that they are distinguishable from all …

- Robert Koch

Our studies have shown that all cases of typhoid of this type have arisen by contact, that is, carried directly from one person to another. There was…

- Robert Koch