A microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. ..
Fungi can be single cell or very complex multicellular organisms, they live in other plants and animal, examples of Fungi are Mushroom, Yeast, Moles and can infect the mouth vagina, skin feet and other body areas. Eg. Skin disease and Athlete foot.
Bacteria are single cell Microbes often called Germs and can cause infection in the body system. All Bacteria reproduce by a process called Binary Fission, this is they divide into two, Bacteria are found in every habitat on earth. When conditions are favorable such as the right temperature and nutrients are available, some bacteria like Escherichia Coli can divide every twenty minutes, this means that in seven hours one bacterium can generate 2,097,152 Bacteria; most Bacteria are killed when they are heated above 50 degrees Celsius or if they become dry.
These are one-cell animal, they are very small and are common in fresh water and moist soil. Protozoa ingest or feed on small particles of food such as bacteria, they reproduce by dividing into two and they can infect the Blood, Brain, Intestines and other body area. Common infectious disease caused by Protozoa include: Malaria, Giardia and Toxoplasmosis
Prions are a type of Protein that cause disease in animals and Humans by triggering normally healthy Proteins in the Brain to fold abnormally. The Prions mode of action is very different to Bacteria and Viruses as they are simply Proteins devoid of any genetic material. Once misfolded Prions enters a healthy person potentially by eating infected food; it converts correctly-folded Proteins into the disease associated form. Prions attack nerve cells producing Neurodegenerative Brain Disease (Mad Cow) symptoms include glazed eyes and uncontrollable body tremor.
Algae are a single or multi-cellular organism that has no roots, stems or leaves and is often found in fresh water or sea water. Algae can exist as single cell eg chlamydomonas or joined together in chains like spirogyra or made up of many cells eg rhoydymenia (red seaweed) they can either be free floating or attached to the bottom. Some Algae can grow on rocks, soil or vegetation as long as there is enough moisture…
Virus are the smallest of all the microbes, they multiply in the cells of other living things. The cell they multiply in is called the host or reservoir. They cause many diseases ranging from the common cold to herpes, aids and hepatitis.