identify the key factors that will make it more likely that infection will occur
Infections are classified in multiple ways. [ They are classified by the causative agent as well as by the constellation of symptoms and medical signs that are produced.Organisms that can cause illness are all around us: in air, water, soil, and food, as well as in the bodies of animals and other people. Infection occurs when some of them get past a series of natural defenses. Those defenses
Skin: The skin physically blocks germs, but may let them in if it is cut or scraped.
Coughing deeply: This expels germs from the lungs and breathing passages but may be less effective for weak, sick, or injured people.
Bacteria: Called "resident flora," harmless bacteria normally are present in some parts of the body. They compete with harmful germs and crowd them out. But they can be weakened or killed by medications, allowing harmful germs to thrive and cause illness.
Inflammatory response: This is produced by the body's immune system. Certain kinds of white blood cells—including macrophages and neutrophils—surround and destroy or otherwise attack any kind of germs, often causing fever, redness, and swelling.
Antibodies: These are proteins produced by the immune system. Some are targeted to attack specific microbes. This response is also called humoral immunity. Usually these antibodies are produced after a person is infected by or exposed to the microbe.
Read more: Infection - body, viral, causes, How Does Infection Occur?
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