How did Robert Koch's work differ from Louis Pasteur's work on microbes and disease?

While both Robert Koch and Louis Pasteur were foundational figures in the development of germ theory, their approaches to microbiology differed in focus and methodology.1

Louis Pasteur, a chemist by training, focused on the broader biological processes caused by microorganisms, such as fermentation and decay, and pioneered the development of vaccines through the use of attenuated or neutralized agents. His work often addressed the physiological effects of microbes on hosts and led to the establishment of immunology and preventive medicine.234

In contrast, Robert Koch, a physician, focused on the precise identification and isolation of specific pathogens. He revolutionized the field by developing rigorous laboratory techniques, such as the hanging-drop technique and methods for staining and photographing bacteria. Most notably, he established Koch’s postulates, a definitive scientific framework used to prove that a specific microorganism is the cause of a specific disease. While Pasteur’s work was essential in proving that microbes cause disease, Koch’s work provided the systematic criteria required to link individual pathogens to their respective illnesses.561