Cylindrical bacterial cells are called bacillus, whereas spherical bacterial cells are referred to as vibrio.
The cell wall is responsible for giving shape to bacterial cells is also shown when the wall is removed by enzymes. A cylindrical bacterial cell on losing the wall assumes a spherical shape.
A bacterium can be spherical or cylindrical. A spherical bacterium is generally known as a coccus and a cylindrical bacterium, when it is straight, goes under the name of a bacillus. If the cylindrical cell is curved, it is known as a vibrio . Some bacteria have also flexible cells.
Bacillus species are rod-shaped, endospore-forming aerobic or facultatively anaerobic, Gram-positive bacteria. Vibrio is a genus of Gram-negative bacteria, possessing a curved-rod shape, several species of which can cause foodborne infection.
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