Veterinary medicine was separated from human medicine in 1761 with the founding of the first veterinary school in Lyon, France. Before this, doctors treated both humans and animals. The modern era of biomedical research began in the late 18th century with discoveries like Edward Jenner's smallpox vaccine and Robert Koch's findings about bacteria transmission. Key early scientists who studied cells under microscopes in the 1600s-1800s helped develop the cell theory. In the post-18th century period, many important researchers from various countries made contributions to medicine. As science and technology advanced, medicine became more reliant on medications and pharmacology while adopting evidence-based practices.