10 points on the harmfulness of microorganisms?
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Microorganisms like viruses when get inside the host body can cause several diseases. Most common of them are cold, viral fever, etc.
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* microbial virulence – a relative ability of a microbe to cause a disease; for example, a certain, higly virulent subtype of influenza virus may cause a bird flu, which is deadly in a high percent, while “usual” influenza virus is not.
* invasion through the body’s barriers; staph bacteria might not cause any harm to a person with an intact skin, but can cause a severe infection of a skin wound.
* amount of microbes; eating few bites of food contaminated with staph bacteria may go unnoticed, while eating the whole portion of the same food may cause a severe food poisoning.
* body’s defense (immune) system; patients with a weak immune system, like those receiving corticosteroids, often get oral thrush (candida infection of the mouth), while otherwise healthy people do not.
* invasion through the body’s barriers; staph bacteria might not cause any harm to a person with an intact skin, but can cause a severe infection of a skin wound.
* amount of microbes; eating few bites of food contaminated with staph bacteria may go unnoticed, while eating the whole portion of the same food may cause a severe food poisoning.
* body’s defense (immune) system; patients with a weak immune system, like those receiving corticosteroids, often get oral thrush (candida infection of the mouth), while otherwise healthy people do not.
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