Unit 4222-265

Unit 4222-265
Causes and spread of infection

Outcome 1
1. Bacteria- single celled organism, bacteria have evolved to thrive in almost any environment and can be found in almost any substance and also in the human body, only 1% of bacteria is actually harmful. It`s bad or infectious bacteria that cause illness as they rapidly reproduce and produce a toxin that kills or mutates cells, bacteria is also self-sufficient.
Virus- small capsule that contain DNA or RNA, viruses, unlike bacteria are not self-sufficient and need a host in order to reproduce- human body. When a virus enters the body, it enters some certain cells and takes over making the now host cell make the parts the virus needs to reproduce, the cells are eventually destroyed through this process.
Fungi- mould, yeast and mushrooms are all types of fungi. Live in the air, water, soil and on plants and they live in the body, usually without causing illness. Some fungi have benefits uses- penicillin. Fungi are also essential in making certain foods- bread and cheese.
Parasite- tiny organism that lives in or on a host which they use in order to feed. Parasites can cause severe illness`s, there are 3 main types of parasites: protozoa, helminths, and ectoparasites. They are able to multiply in humans, which contributes to their choice and also gives way to serious infections to develop.
2. Bacteria- bacterial infections can be mild to life threatening illnesses such as salmonellosis, tuberculosis, MRSA, coccidiosis, food poisoning, dysentery, bronchitis, ear infection, tonsillitis, pneumonia etc. Bacterial infections are usually confined to one part of the body.
Viruses- common viruses are colds, influenza, stomach flu, HIV, herpes, warts, west Nile virus. There few drugs used to treat viral infections and the best strategy is to vaccinate so that the body is able to resist.
Fungi- fungi`s illnesses are valley fever, athlete`s foot, ring worm, thrush. Fungal infections of the skin are among most...