Modified from Barbero GJ: Recurrent abdominal pain. Pediatrics in Review 4:30, 1982 and from Greenberger NJ: Sorting through nonsurgical causes of acute abdominal pain. Journal of Critical Illness7:1602â1609, 1992.
Early Modern. Antonie van Leeuwenhoek is considered a father of microbiology as he pioneered the use of simple single-lensed microscopes of his own design. In 1676, Anton van Leeuwenhoek, who lived most of his life in Delft, Holland, observed bacteria and other microorganisms using a single-lens microscope of his own design.
Van Leeuwenhoek discovered protozoa - the single-celled organisms and he called them animalcules. He also improved the microscope and laid foundation for microbiology. He is often cited as the first microbiologist to study muscle fibers, bacteria, spermatozoa and blood flow in capillaries.