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A microorganism is called a "pathogen".
The smallest organism to do so is called a virus
These diseases are caused by "viruses".
MUMPS
Bacteria!!
Any microorganism that causes disease.
any microorganism that causes disease.
Mumps
Not directly, but the infectious microorganism that causes the disease may produce a toxin that is the cause of some of the disease's symptoms. Not every disease causing microorganism produces a toxin.
Mumps
An agent that causes disease, especially a living microorganism such as a bacterium or fungus.
The member of ciliate family which causes disease is known as Balantidium coli. The microorganism causes fatal disease of the gastrointestinal tract.