History of Medicine 1857 1883 1928 1955 Today Germ Theory Louis Pasteur hypothesizes that disease is caused by small organisms.
The Immune System Pathogens Defined: microorganisms that cause disease – Viruses: turn cells into virus making factories.
The Immune System History of Medicine 1857 1883 1928 1955 Today Germ Theory Louis Pasteur hypothesizes that disease is caused by small organisms.