Scientific History of Medicine By JGoins2017 Jan 1, 1857 Louis Pasteur identifies germs as cause of disease Jan 1, 1887 First contact lenses developed Jan 1, 1895 Wilhelm Conrad Roentgen introduced the use of X rays Jan 1, 1899 Felix Hoffman develops aspirin Jan 1, 1901 Karl Landsteiner introduces the system to classify blood into A, B, AB, and O groups Jan 1, 1913 Dr. Paul Dudley White pioneers the use of the electrocardiograph Jan 1, 1921 Earle Dickson Invented the Band-Aid Jan 1, 1928 Sir Alexander Fleming discovers penicillin Jan 1, 1935 First vaccine developed for yellow fever Jan 1, 1937 Bernard Fantus pioneers the use the first blood bank in Chicago Jan 1, 1950 John Hopps invented the first cardiac pacemaker Jan 1, 1954 Dr. Joseph E. Murray performs the first kidney transplant Jan 1, 1967 First human heart transplant was done by Dr. Christiaan Barnard Jan 1, 1975 Robert S. Ledley invents CAT-Scans Jan 1, 1977 First vaccine developed for pneumonia Jan 1, 1992 First vaccine developed for hepatitis A Jan 1, 2006 First vaccine to target a cause of cancer