1900

• Dr. Ludvig Hektoen creates one of the earliest experimental disease models, for cirrhosis of the liver.
• Dr. Ernest Amory Codman begins his work on diseases and injuries of the shoulder.
• On January 1, more than 7,000 women physicians practice medicine in the U.S.
• In February, Dr. George Blumer demonstrates that trichinosis, a disease caused by a worm infecting undercooked pork, is more widespread in the United States than previously believed.
• In February, Sen. Jacob H. Gallinger introduces a bill to regulate medical research on humans in the District of Columbia. Congress does not enact the bill.
• On March 6, the body of a Chinese laborer is discovered in the Globe Hotel's basement in the Chinese district of San Francisco. Local officials find that he died of bubonic plague. The outbreak of the disease will last for four years and kill more than one hundred people.
• On...