Bacteria:
Discovered bacteria by the world of Louis Pasteur and the world Robert Koch between the years 1676 and 1870, and through their research on food decaying and pathogens have been found to bacteria organisms and unicellular larger than viruses and smaller than the algae diameter ranges between (0.2 - 2) microns in length and between (2-10) microns, and some are up to giant (100) microns in length.
Forms of bacteria:
1- spherical:
the ball-like, like the bacteria that causes pus and pneumonia and gonorrhea. There are spherical bacteria either individually or grouped two or four or eight or in the form of a rosary or a cluster.
2- rod:
It is in the form of a stick can shorten or lengthened. Examples include bacteria that causes typhoid and dysentery bacteria which no individual or grouped to form chains.
3- Spiral:
They are found in the form of a spiral (twisted Such as auger) They differ in terms of form and method of movement Examples include syphilis-causing bacteria.
4- OUEN:
in the form of a letter و such as cholera-causing.
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viruses