Causes and Spread of Infection

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Causes and spread of infection Understand the causes of infection Outcome 1 Identify the differences between bacteria, viruses, fungi and parasites All 4 are different types of pathogens Bacteria is a single celled organism that multiply by themselves. They live within and on most living and non-living things. The majority of bacteria 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 course 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. Viruses can be very tough and there are not many effective medicines available for viral diseases. There are currently 21 families of viruses known to cause disease in humans. 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. Like bacteria and viruses, some fungi can act as pathogens. Human fungal diseases can occur due to infection or fungal toxins. Symptoms of 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 need other organism for their survival. They draw nourishment and other needs from their host organism. Parasites that cause infection and disease are known as Pathogenic parasites Identify common illnesses and infections caused by bacteria, viruses, fungi and parasites Virus Common cold, flu, mumps, measles, Chicken pox, Cold sores, HIV,

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