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  2. Germ theory of disease - Wikipedia

    en.wikipedia.org/wiki/Germ_theory_of_disease

    The bacterium that causes cholera. The germ theory of disease is the currently accepted scientific theory for many diseases. It states that microorganisms known as pathogens or "germs" can cause disease. These small organisms, too small to be seen without magnification, invade humans, other animals, and other living hosts.

  3. Bacteria - Wikipedia

    en.wikipedia.org/wiki/Bacteria

    They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust.

  4. Bacteriology - Wikipedia

    en.wikipedia.org/wiki/Bacteriology

    Scanning electron micrograph of Escherichia coli, a common human pathogen and research organism. Bacteriology is the branch and specialty of biology that studies the morphology, ecology, genetics and biochemistry of bacteria as well as many other aspects related to them. This subdivision of microbiology involves the identification ...

  5. Microorganism - Wikipedia

    en.wikipedia.org/wiki/Microorganism

    v. t. e. A microorganism, or microbe, [a] is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells . The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.

  6. Branches of microbiology - Wikipedia

    en.wikipedia.org/wiki/Branches_of_microbiology

    Pure microbiology. Bacteriology: the study of bacteria. Mycology: the study of fungi. Protozoology: the study of protozoa. Phycology /algology: the study of algae. Parasitology: the study of parasites. Immunology: the study of the immune system. Virology: the study of viruses.

  7. Germ theory's key 19th century figures - Wikipedia

    en.wikipedia.org/wiki/Germ_theory's_key_19th...

    Germ theory's key 19th century figures. In the mid to late nineteenth century, scientific patterns emerged which contradicted the widely held miasma theory of disease. These findings led medical science to what we now know as the germ theory of disease. [1] The germ theory of disease proposes that invisible microorganisms ( bacteria and viruses ...

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