Unit ICO2 Causes and spread of infection
Outcome 1 Understand the causes of infection
The learner can:
1. Identify the differences between bacteria, viruses, fungi and parasites? Bacteria : Bacteria are one cell structures that multiply rapidly and can become a colony of 2 million within 2 hours. Viruses : Visible can only be seen with an electron microscope they can float in the air, sit on a door handle or remain non-living. They become active when they are allowed access to a living cell. Fungi : Not all fungi can cause us problems, Fungi are plant-like structures that survive on dead organic materials. Parasites: Human parasites include various protozoa and worms which may infect humans, causing parasitic diseases.
2. Identify common illnesses and infections caused by bacteria, viruses, fungi and parasites Bacteria - Upper respiratory tract infections,Otitis media,Lower respiratory tract infections,Tuberculosis (TB),Salmonella,Escherichia coli ,Helicobacter pylori. Viruses - Common cold,Hepatitis B,Influenza,HIV/AIDS,Measles,Chicken Pox,Gastroenteritis,Rubella (German Measles),Viral meningitis,Viral Pneumonia and Mumps Fungi - Athletes Foot,Ring worm,Thrush .
Parasites – Tapeworm,Malaria,Bed bugs,Thread worms,Scabies
3. Describe what is meant by “infection” and “colonisation”? Infection is a invasion of a host organism's bodily tissues by disease-causing organisms, their then multiplication and the reaction of host tissues to these organisms and the toxins they produce.The presence of bacteria on a body surface like on the skin, mouth, intestines or airway without causing disease in the person.
4. Explain what is meant by “systemic infection” and “localised infection”? Systemic infection affects the whole body and causes systemic symptoms, like muscle pains, fever and nausea but with Localised infection, it limited to one or few body parts and presents with localised symptoms, like redness, swelling, pain...
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