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.
History of Medicine 1857 1883 1928 1955 Today Germ Theory Louis Pasteur hypothesizes that disease is caused by small organisms.
