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  2. Virus - Wikipedia

    en.wikipedia.org/wiki/Virus

    A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. [1] Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. [2] [3] Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity.

  3. Viruses and bacteria have similarities, but the ways we ... - AOL

    www.aol.com/viruses-bacteria-similarities-ways...

    Bacteria and viruses are often lumped together as germs, and they share many characteristics. They’re invisible to the human eye. They’re everywhere.

  4. Introduction to viruses - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_viruses

    A virus with this "viral envelope" uses it—along with specific receptors—to enter a new host cell. Viruses vary in shape from the simple helical and icosahedral to more complex structures. Viruses range in size from 20 to 300 nanometres; it would take 33,000 to 500,000 of them, side by side, to stretch to 1 centimetre (0.4 in).

  5. Bacteria - Wikipedia

    en.wikipedia.org/wiki/Bacteria

    The Gram stain, developed in 1884 by Hans Christian Gram, characterises bacteria based on the structural characteristics of their cell walls. [ 174 ] [ 75 ] The thick layers of peptidoglycan in the "Gram-positive" cell wall stain purple, while the thin "Gram-negative" cell wall appears pink. [ 174 ]

  6. Infection - Wikipedia

    en.wikipedia.org/wiki/Infection

    Since bacteria ferment carbohydrates in patterns characteristic of their genus and species, the detection of fermentation products is commonly used in bacterial identification. Acids , alcohols and gases are usually detected in these tests when bacteria are grown in selective liquid or solid media.

  7. Virulence - Wikipedia

    en.wikipedia.org/wiki/Virulence

    The ability of bacteria to cause disease is described in terms of the number of infecting bacteria, the route of entry into the body, the effects of host defense mechanisms, and intrinsic characteristics of the bacteria called virulence factors.

  8. Microorganism - Wikipedia

    en.wikipedia.org/wiki/Microorganism

    Bacteria and archaea are almost always microscopic, while a number of eukaryotes are also microscopic, including most protists, some fungi, as well as some micro-animals and plants. Viruses are generally regarded as not living and therefore not considered to be microorganisms, although a subfield of microbiology is virology, the study of viruses.

  9. Virus classification - Wikipedia

    en.wikipedia.org/wiki/Virus_classification

    Virus classification is the process of naming viruses and placing them into a taxonomic system similar to the classification systems used for cellular organisms. Viruses are classified by phenotypic characteristics, such as morphology, nucleic acid type, mode of replication, host organisms, and the type of disease they cause.