Spirochaetes
Category : 11th Class
These are free inhabitants of mud and water, and are chemoheterotrophic unicellular bacteria. These are spiral or helicoid in shape, covered by flexible cell wall. In spirochaetes flagella are absent but the cells are able to swim over solid surface by the fibrillae. Many diseases are caused by them as Treponema pallidum causes syphilis, Leptospira causes infectious jaundice and Borrelia causes relapsing fever. Besides some spirochaetes are found in teeth.
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