Viruses are many times smaller than bacteria.(smallest cell there is that consists of genetic material)
Viruses can only reproduce inside host cells, and they damage the cell when they do this.
Once a Virus gets inside a cell it can make 100's of copies of its self and keep reproducing.
-Eventually they will burst the cell and then the viruses are passed out in the bloodstream, the airways, or by other routes.
Diseases caused by viruses include:
- influenza - flu
- colds
- measles
- mumps
- rubella
- chicken pox
- AIDS
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