Cody Trezise 06 october 2011
Chain of infection & how bacteria grow.
In this essay I am going to be describing and explaining n about how pathogenic organisms grow and spread, by explaining each stage of the chain of infection, step by step and what they involve.
This representive is used to help us understand the infection progression. A circle of linked components represent what happens in the cycle of infection. The links are: infectious agent, Reservoir (where it will live), portal of exit ( how it will escape e.g contact through other humans ect ), Mode of transmission, and the portal of entry into the susceptible host.
The infectious agent is a microbial organism with the capability to cause disease. The greater the organism's virulence (competence to grow and multiply), invasiveness (competence to enter tissue) and pathogenicity (competence to cause disease), the greater the possibility that the organism will cause an infection. Infectious agents are bacteria, virus, fungi, and parasites. Secondly the reservoir is A place inside the micro-organisms where they can thrive and reproduce. For example, microorganisms thrive in human beings, animals, and regular objects which are used and touched such as water, table tops, doorknobs, and railings.
The ‘portal of exit’ is a place of exit providing a way for a micro-organism to leave the reservoir. For example the micro-organism could leave the body through the nose by sneezing or as effectively by coughing through the mouth. Microorganisms carried away from the body by feces (when going to the toilet), may also leave the reservoir of an infected bowel. The mode of transmission is a method of transfer by which the organism moves or is then carried from one place to another. Hands of a health care worker/ nurse ect can carry bacteria from one person to another. The portal of entry is an opening allowing the microorganism to...
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