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Anthrax bacilli differs from anthracoid bacilli by being:

  • A.Non-capsulated
  • B.Strict aerobe
  • C.Non-motile
  • D.Hemolytic colonies on blood

Answer: C

Correct answer: Non-motile

Bacillus anthracis is the only non-motile member of its genus, and this is one of the standard tests distinguishing it from the anthracoid bacilli - the saprophytic Bacillus species that resemble it on culture. It is also capsulated, which they are not, and non-haemolytic on blood agar, whereas they are usually haemolytic. Both anthrax and the anthracoids are aerobic or facultatively anaerobic, so that is not a distinguishing feature, and the remaining options state the reverse of the truth.

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