P2: you must explain how pathogenic microorganisms grow and spread.
In this assignment I am going to explain how infections are caused by, bacteria, viruses, fungi and parasites. I will then explain how pathogenic microorganisms grow and spread.
Infection is the process where germs enter a susceptible area in the body, where they multiply, resulting in disease.
Colonisation is where microbes are present on or in the body, where they grow and multiply without invading the surrounding tissues. An example of this is the bacteria that cause MRSA will often live harmlessly on the skin and in the nose of people without causing any harm at all to that individual.
Localised infection is only confined to one certain part of the body and will only affect that specific area. If they are internal they can be very serious, such as appendicitis or endocarditis. An infected cut may also be another example of this; symptoms may include hot skin, pain, redness, swelling and a pussy discharge. These localised infections do not usually make you ill, but without the proper care they could cause a systemic infection.
Systemic infections will affect the whole of the body by spreading through the bloodstream. Examples of this include tonsillitis, influenza, malaria and chicken pox. Symptoms of systemic infections include; fever, chills, weakness and aching joints.
The chain of infection begins with a pathogen. The pathogen needs the right environment to enable them to grow. They need a route of transmission and a portal of entry. They then begin to multiply and make the host feel ill, then some of the pathogens will now exit the body and the chain begins again.
Infections are caused by microbes which are found everywhere such as dust, homes, animals and humans. Some microbes are helpful to us and are called normal flora, others can be harmful and cause infections, and these are