Causes and Spread of Infection Essay

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CU254 Causes and Spread of Infection Understand the causes of infection 1.1 Bacteria are living things that are neither plants nor animals, but belong to a group all by themselves. They are very small—individually not more than one single cell however there are normally millions of them together, for they can multiply really fast. Bacteria are prokaryotes (single cells that do not contain a nucleus). Every species has a great ability to produce offspring and its population expands until it runs out of food or it is limited by competition, its own waste products, or some other factor. Changes in climate or introduction of a new species from elsewhere can greatly affect the balance of nature. A virus is a small infectious agent that can replicate only inside the living cells of organisms. Most viruses are too small to be seen directly with a light microscope. Viruses infect all types of organisms, from animals and plants to bacteria and archaea. All viruses have genes made from either DNA or RNA, long molecules that carry genetic information; all have a protein coat that protects these genes; and some have an envelope of fat that surrounds them when they are outside a cell. Fungi are living things found in the Euskara domain. They can be found in soil and vegetation and even on our bodies in parts. The most common type of fungi is mushrooms. Fungi reproduce by sporulation which is the process of releasing spores out into the world. Many fungi are not dangerous; in fact some are actually used to treat infection commonly known as penicillin which is a powerful antibiotic. Yeast is also a fungus to make bread, beer and wine. A parasite is an organism living on or in another organism and using the other organism for food or energy. Since a parasite is something that infects the body, they can cause infectious disease. 1.2 Illnesses/infections caused by bacteria can

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