Shape of bacteria

2021-08-27 05:53 PM

Cocci are clustered like bunches of grapes, divide in a plane, some are pathogenic to humans and often develop rapid resistance to many antibiotics

Bacteria normally have a definite shape determined by the cell wall. Some septa (L-forms) such as Mycoplasma do not have a definite shape. The average diameter of bacteria is about 1 µm. The smallest representatives such as Mycoplasma are about 0.1 µm in diameter and the larger representatives are tens of mm in size such as Spirilium volutans 20 µm. Pathogenic bacteria range in size from 0.2 µm to 10 µm

In terms of shape, bacteria can be divided into cocci, bacilli, and spiral-shaped bacteria

Cocci

Are spherical, egg-shaped, or coffee bean-shaped bacteria?

Micrococci

These are evenly or irregularly lined cocci, which are impurities found in the air and water.

Diplococci

Cocci are arranged in pairs that divide in a plane. Some cause diseases in humans such as pneumococcal, gonococcal, meningococcal bacteria.

Streptococcal

Cocci are short or long chains of cocci. Some species are pathogenic to humans, such as Streptococcus pyogenes of Lancefield's group A.

Tetracocci

The cocci are composed of 4, divide in two planes, very rarely cause disease.

Sarcina

Cocci are arranged in 8-16 species, divided in three planes, usually found in the air.

Staphylococci

Cocci are clustered like bunches of grapes, divide in a plane, some are pathogenic to humans and often develop rapid resistance to many antibiotics.

Bacteriophage

They are straight rod-shaped bacteria.

Bacteria

These are aerobic, non-spore-forming bacilli such as biliary tract bacteria, leukemic bacteria, tuberculosis bacteria...

Bacilli

Are spore-forming aerobic bacilli such as anthrax bacilli.

Clostridia

These are Gram-positive anaerobic spore-forming bacilli, such as tetanus bacilli, botulism bacilli.

Spiral bacteria

Bacteriophage

Only one part of the helix should have a comma, for example, the cholera comma.

Spirochetes

There are many spirals, for example, spirochetes syphilis, Leptospira, Borrelia.

 

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