Pathophysiology a convergence of pathology with physiology is the study of the disordered physiological processes that cause, result from, or are otherwise associated with a disease or injury. Pathology is the medical discipline that describes conditions typically observed during a disease state, whereas physiology is the biological discipline that describes processes or mechanisms operating within an organism. Pathology describes the abnormal or undesired condition, whereas pathophysiology seeks to explain the functional changes that are occurring within an individual due to a disease or pathologic state.

In the 1950s, researches on rheumatic fever, a complication of streptococcal infections, revealed it was mediated by the host's own immune response, stirring investigation by pathologist Lewis Thomas that led to identification of enzymes released by the innate immune cells macrophages and that degrade host tissue. In the late 1970s, as president of Memorial Sloan Kettering Cancer Center, Thomas collaborated with Lederberg, soon to become president of Rockefeller University, to redirect the funding focus of the US National Institutes of Health toward basic research into the mechanisms operating during disease processes, which at the time medical scientists were all but wholly ignorant of, as biologists had scarcely taken interest in disease mechanisms. Thomas became for American basic researchers a patron saint.

The first biomedical institutes, Pasteur Institute and Berlin Institute for Infectious Diseases, whose first directors were Pasteur and Koch, were founded in 1888 and 1891, respectively. America's first biomedical institute, The Rockefeller Institute for Medical Research, was founded in 1901 with Welch, nicknamed "dean of American medicine", as its scientific director, who appointed his former Hopkins student Simon Flexner as director of pathology and bacteriology laboratories. By way of World War I and World War II, Rockefeller Institute became the globe's leader in biomedical research.

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