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General Microbiology & Immunology (PM 401)    second level    Semester 4       2024/2025


                  3. Spiral

                      •  Spiral-shaped bacteria occur in one of three forms:

                         A. Vibrio                      B. Spirochetes                       C. Spirillum









                  •  These are the slightly curved  •  Spirochetes  are  spiral        •  Spirillum: a thick,
                    bacteria resembling a comma                                              rigid spiral
                    shape.                                bacteria    having      a
                                                          helical  shape  (a  thin,

                                                          flexible spiral)






















                                                         Treponema pallidum              Spirillum volutans
                            Vibrio cholera













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