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There are three main types of micro organism that can cause disease

Bacteria, these are prokaryotes and have no true nucleus. Bacterial diseases include tuberculosis, gonorrhea, tetanus etc. Infections can result when bacteria get into the "wrong parts" of the body and are able to reproduce. For example E.coli is normally excreted in the faeces but if ingested through poor hygience (faecal-oral) or through poor food preparation it can cause stomach upset. Bacterial infections can be treated with antibiotics.

Fungi, these are eukaryotic organisms and include all yeasts. Fungi cause infections such as thrush, athletes foot and ringworm.

Viruses, these are not alive but can cause damage to host cells. They need a host cell in order to grow and reproduce. Viral diseases include HIV, Influenza, measles, chicken pox, herpes. Antibiotics do not work on viruses as they need body cells to reproduce. When they leave the cell in which they invade they cause damage to the cell resulting in symptoms of the disease,

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