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Subterminal spores are found in:

  • A.Clostridium sordelli
  • B.Clostridium sporogenes
  • C.Clostridium tetani
  • D.Clostridium tertium

Answer: A

Correct answer: Clostridium sporogenes

The clostridia are classified by the shape and position of the spore. C. sporogenes has an oval subterminal spore, as do C. perfringens, C. septicum, C. novyi and C. histolyticum. C. sordellii and C. tertium carry oval terminal spores, and C. tetani a spherical terminal one that swells the rod into the drumstick. Spore position is one of the first things looked at on a Gram film and narrows the identification considerably.

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