Causes and Spread of Infection 265

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Causes and spread of Infection

1. Understand the causes of Infection
1.1 Identify the differences between bacteria, viruses, fungi and parasites More accurately, parasites are actual animals, along with mites, and mites are so small you have some thousands living in your eyebrows. Bacteria are one cell things with a cell wall. Virae (viruses) are code only--they are the core requirement that bacteria have, but without all the other protective layers like cell wall and energy production. Instead, they latch onto living things, and the code (DNA) then hijack the systems of that living thing to produce more copies of the virus. Bacteria merely need food (from anywhere) to reproduce. Fungi are a separate class of living being, not animal, not plant. They include everything from the stuff on your scalp giving you dandruff to the shiitake mushrooms on your steak.

1.2 Identify common illnesses and infections caused by bacteria, viruses, fungi and parasites pneumonia is a common bacterial or viral illness
staph infection - caused by staphylcoccus bacteria
ringworm is caused by a fungus
parasitic illness: tapeworm, trichinosis
the common cold is a viral illness, so is Flu
1.3 Describe what is meant by ‘infection’ and ‘colonisation’ 1) Infection is a noun.
*The process of infecting or the state of being infected
*Invasion by and multiplication of pathogenic microorganisms in a bodily part or tissue, which may produce subsequent tissue injury and progress to overt disease through a variety of cellular or toxic mechanisms.

2)Colonization is a noun.
*The act or process of establishing a colony or colonies.
*The spreading of a species into a new habitat. For example, flying insects and birds are often the first animal species to initiate colonization of barren islands newly formed by vulcanism or falling water levels. The first plant species to colonize such islands are often transported there as airborne seeds or through the droppings of birds. 1.4...
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