Causes and Spread of Infection

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1.1Identify the differences between bacteria, viruses, fungi and parasites

Bacteria are a single celled organism that multiplies by themselves. The majority of bacteria’s are harmless and beneficial to the human body but some can cause infectious diseases. A bacterium usually affects one part of the body and doesn’t spread across or through the body. Bacterial infections are normally treated with a cause of antibiotics

Viruses are made up of genes and proteins that spread throughout the body by invading the body’s own cells so they can reproduce and multiply in the body. They use the body’s cells as a host because they are unable to multiply on their own. They are normally spread directly from human to human.

Fungi like to grow in warm, moist places. Some fungi can be beneficial to us such as penicillin, but certain types of fungi can be harmful to our health. Symptoms for fungal diseases can be as common as itching, coughing, fever, wheezing, but they can also be as serious as meningitis or even death.

Parasites are organisms that use other organism for its survival. They draw nourishment and other needs from its host organism. Parasites that cause infection and disease are known as Pathogenic parasites.

1.2. Identify common illnesses and infections caused by bacteria, viruses, fungi and parasites

Bacteria: Ecoli/food poisoning, MRSA, CDIF, Sickness and diarrhea Viruses: Common cold, Influenza, Chicken pox, Cold sores, HIV Fungi: Athletes foot, Thrush, yeast infections, Ring Worm
Parasites: Tape worms, Scabies, Malaria

1.3 Describe what is meant by infection and colonisation

Infection – is an invasion of a host organisms and bodily tissues by a disease causing organism. Colonisation – occurs when any one or more species populate a specific area.

1.4 Explain what is meant by systemic infection and localized infection

Systemic infection – affects a number of organs or tissues or affects the whole body e.g. type 2 diabetes,...
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