Nvq2 Essay

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Causes and spread of infection 1. identify the differences between bacteria, viruses, fungi and parasites Bacteria- A single cell micro- organism that gets its nutrition from its surroundings and can only be seen under a microscope. Viruses- are disease producing agents far smaller than bacteria. They are enclosed in a protein coating which makes them more difficult to destroy. Fungi- Are included in the plant kingdom but is quite different from green plants. The basic unit of a fungus is a hypha which is a hollow tube. The Hypha threads spread out over and into the food material making a visible mesh or mycelium. Some fungi mass together to create toadstools. They spread by releasing spores into the environment. Parasites-An organism that feeds and is dependant of its host. 2. Identify common illnesses and infections caused by bacteria, viruses, fungi and parasites Bacteria-Lyme diseases, Tuberculosis, Tetanus, MRSA (Methicillin resistant staphylococcus aureus) Viruses- Polio, Norovirus, common cold, flu, chicken pox Fungi- Tinea pinus, athletes foot, oral thrush Parasites-Worms,ticks,lice,mites 3. Describe what is meant by infection and colonisation Infection- is an invasion of a host organism’s bodily tissues by disease causing organism Colonisation- Occurs when any one or more species populate a specific area. 4. Explain what is meant by systemic infection and localised infection Systemic infection- Affects a number of organs or tissues or affects the whole body e.g. type 2 diabetes, aids and hyper tension. Localised infection-confined to one organ system or area in the body e.g. absess sprain. 1.5 Identify poor practises that may lead to the

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