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| 1903 |
| | | Dutch physiologist Willem Einthoven invents the galvanometer, or electrocardiograph, for recording the electrical impulses within the heart muscle | |
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| 1904 |
| | | Austrian psychologist Sigmund Freud publishes The Psychopathology of Everyday Life | |
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| 1906 |
| | | German immunologist August von Wasserman develops a diagnostic test to reveal the presence of the syphilis spirochaete in the blood | |
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| 1906 |
| | | Belgian physiologists Jules Bordet and Octave Gengou identify Bacillus pertussis, the bacterium causing whooping cough | |
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| 1906 |
| | | A pediatrician in Vienna, Clemens von Pirquet, describes a condition for which he coins the term 'allergy' | |
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| 1906 |
| | | The German neuropathologist Alois Alzheimer identifies physical symptoms in the brain of a dead woman who had presenile dementia | |
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| 1907 |
| | | Austrian scientist Clemens von Pirquet discovers a diagnostic test to identify tuberculosis in a patient | |
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| 1909 |
| | | French biologist Charles Nicolle discovers that epidemic typhus is transmitted by the body louse | |
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| 1910 |
| | | Chicago cardiologist James Herrick publishes the first account of the cells causing sickle-cell anaemia | |
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| 1911 |
| | | Alfred Adler ends his association breaks with Sigmund Freud and forms his own school of psychology | |
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