Swarming growth on Blood Agar

  • Swarming or spreading in wave form is seen with motile organisms particularly Proteus mirabilis.
  • Cause of swarming – The flagella of bacteria are naturally set to spin counter-clockwise causing the bacteria to be propelled forward. Only as toxin concentration goes up or nutrient concentration goes down does the cell switch to clockwise rotation.
Proteus mirabilis on blood agar

Proteus mirabilis on blood agar

 

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