NEET BIOLOGY

Detailed explanation-1: -Spirillum (plural, spirilla). A bacterium with rigid spiral (helical) structure (not easily band, not flexible), thick, long, and move with flagella, 6–15 m long and spiral in shape is called spirillum. For example, Campylobacter jejuni and Helicobacter pylori.

Detailed explanation-2: -Spirilla-are spiral or corkscrew-shaped bacteria. They are divided into subgroups. They cause syphilis and Lyme disease.

Detailed explanation-3: -Members of the genus Spirillum are large, elongate, spiral shaped, rigid cells. Some have tufts of amphitrichous flagella at both poles. They are microaerophilic and usually found in stagnant freshwater rich in organic matter.

Detailed explanation-4: -spirochete, (order Spirochaetales), also spelled spirochaete, any of a group of spiral-shaped bacteria, some of which are serious pathogens for humans, causing diseases such as syphilis, yaws, Lyme disease, and relapsing fever. Examples of genera of spirochetes include Spirochaeta, Treponema, Borrelia, and Leptospira.