Types of bacterium

Bacteria are classified according to their shape:

1 Cocci: these spherical-shaped bacteria may form clusters known as staphylococci, or chains known as streptococci, or pairs known as diplococci. They can cause a wide variety of conditions such as boils, carbuncles, impetigo, sore throat, meningitis, pneumonia etc.

2 Bacilli: these rod-shaped bacteria cause serious illness such as diphtheria, tuberculosis, and typhoid fever.

3 Spirochetes: these spiral- or curved-shaped bacteria include spirillium and vibros and cause venereal disease such as syphilis, and serious disease such as cholera.

Cocci (spherical)

Bacilli (rod-shaped)

Spirochete (spirals)

Cocci (spherical)

Bacilli (rod-shaped)

Spirochete (spirals)

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