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Chapter: Microbiology and Immunology: Morphology and Physiology of Bacteria

Size of Bacteria

Bacteria are microscopic and very small in size. The size of bacteria is measured in units of length called microns.

Size of Bacteria

Bacteria are microscopic and very small in size. The size of bacteria is measured in units of length called microns. A micron (micrometer, mm) is the unit of measurement used in bacteriology.


1 micron (mm) 5 1/1000 millimeter (mm).

1 nanometer (nm) 5 1/1000 micron (mm).

1 Angstrom unit (A8) 5 1/10 nm (nanometer).

Bacteria of medical importance measure 2–5 mm (length) 3 0.2–1.5 mm (width).



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