Causes and Spread of infection (ICO2)
Infections are the result of the body’s inability to fight off microorganisms that can cause damage or disease if they are left untreated. They can be viral or bacterial in nature and might be caused by a fungus or parasite. There are many common types and there are some rare ones which all have varying causes and treatments. Common bacterial infections include strep throat, urinary tract infections and E. coli; the different types are caused by many different types of bacteria. Infections are caused by micro-organisms which are known as pathogens, there are three sources of pathogens; •
Within a person’s body- called endogenous
From other people through touching, coughs or sneezes called exogenous •
From contaminated equipment or elements such as dust or water known as environmental. Viral infections are different than bacterial because they are caused by viruses which are smaller than a bacterium or fungus. When a virus infects healthy cells it prevents the cells from doing their job and causes sickness. Viruses infect a specific type of cell which causes viral infections to affect certain parts of the body. A cold is the most common type and generally affects the upper respiratory tract. Influenza is another common infection but symptoms can affect the entire body.
Bacteria are very small singular organisms which can be found almost everywhere; they are the smallest living cells typically only a few micrometres in length. A number of bacteria can cause disease, these are called pathogenic bacteria. Not all bacteria is bad, we need bacteria to stay alive.
Viruses- it is a coated genetic material that invades cells and uses the cells apparatus for reproduction, this is why it is important to wash hands frequently.
Fungi is a multi-celled living organism, it is a large group of eukaryotic organisms that includes...
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