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Van Leewuenhoek
He was the first to use single-lensed microscopes of his own design and make, he was the first to observe and to experiment with microbes. He originally referred to them as "small animals" -
Edwar Jenner
He is considered the father of immunology for getting the smallpox vaccine by immunizing an 8-year-old boy b inserting pus drawn from a pustule. -
Isabel Zendal
She participated in the mass vaccination of smallpox in the Philipppines and was in charge of caring for and accompanying the children who served as carriers of the vaccines from Spain to America and the Philippines. -
Ignaz Semmelweis
He defended the power of hand washing in medical settings after observational studies. He explained that this simple act did not allow germs to spread -
Louis Pasteur
He pioneered the study of molecular asymmetry and discovered that microorganisms cause fermentation and disease, so Pasteur originated the process of pasteurization. He developed vaccines against anthrax and rabies. -
Robert Koch
Robert Koch was one of the founders of bacteriology. He discovered the anthrax disease cycle and the bacteria responsible for anthrax, septicaemia, tuberculosis and cholera, and his methods enabled others to identify many more important pathogens. -
Dmitri Ivanovsky
He discovered that the filtered sap of infected plants was still capable to passing on the “mosaic” leaf disease to healthy plants and he concluded that the causal agent must be an extremely small parasitic microorganism that was quite invisible under the strongest magnification available at the time. -
Alexander Fleming
At St. Mary's Hospital, he discovered penicillin. This discovery led to the introduction of antibiotics that greatly reduced the number of deaths from infection. Started the antibiotic revolution. he was awarded a share of the 1945 Nobel Prize for Medicine.