Nvq Unit 008 Causes and Spread of Infection

Unit 4223-008 Causes and spread of infection
Bacteria is a live micro-organism, usually one celled but can present itself a variety of forms spiral, rod-shaped or in chains. The bacteria are too small for the naked eye to see and has the ability to live in a variety of environments e.g. dirt, water, food and human bodies.
There are many varieties of bacteria and not all bacteria are harmful, some actually perform task such as digesting food or building up the body’s immune system, however some bacteria can be very harmful and cause such diseases has meningitis and pneumonia.
A Virus is an organism that can’t be seen by the naked eye, it is an infection item which can only spreads by replicating itself, but requires a host living cell in order to do this. Viruses can spread and live within bacteria creating a dangerous combination with diseases ranging from the common cold, chicken poxs to HIV/Aids.
Fungi can be single celled or a multicellular organism and can be found in almost any habitat, however only a small number of fungi cause disease in humans, these are usually skin deceases like athletes foot and thrush.
Parasites live on a host and obtains nourishment often detrimentally to the host it has invaded. An example of a parasite would be a tape worm.
Infection and colonisation
Infection is the invasion of an organism's body tissues by disease-causing agents. Colonisation is when bacteria starts reproducing, people can host/colonise disease on the skin and not experience any ailments/symptoms but are able to pass these diseases onto others or infect an open wound and this can cause serious implications an example of such a disease would be MRSA.
Systemic Infection/Localised Infection
A systematic infection is an infection that travels throughout the body, it can travel through the blood steam for example sepsis, were as a localised infection are limited to a specific part of the body e.g a skin infection. Sometime if...