A microorganism is a microscopic organism that can not be seen with the naked eye usually like a virus,bacteria,fungi or a parasite.

Virus: virus are nonliving organisms that are small disease producing particles that are unable to produce without a host.A host cell is the cell that the virus reproduces off of then once they are done it will blow up sending the virus to invade other healthy cells.The way to treat a virus is to get a vaccine. A vaccine is used to help get rid of the virus like the flu vaccine.Virus's spread through human contact,insects (which is also know as a vector) and water.

Bacteria: Bacteria are single celled organisms that are prokaryote that can cause disease and multiply rapidly and form colonies.Bacteria can spread through a sick person coughing or sneezing they also can be passed on through touching or shaking hands with a sick person.Bacteria is treated by antibiotics. Antibiotics are chemicals that kill or inhabit the growth of the bacteria.

To prevent the spread of bacteria 1 wash your hands often washing your hands is a good way to prevent getting a bacterial infection.

Fungi:fungus is a single or multi cellular organism that can decompose or absorb organic matter.Fungus spreads through spores once something is hit like if you kick a mushroom you will see black dust those are the spores.

Parasite:A parasite is a organism that lives in or on another organism called a host taking nutrients and often harming it in the process.Some parasites can be treated with antibiotics some can not.