Medusa head colonies on nutrient agar is seen in?: (A) Pneumococcus, (B) Legionella, (C) Brucella, (D) Anthrax
Answer is D. Ans. is 'd' i.e., Anthrax BACILLUS ANTHRACIS Morphology ? Gram positive Non motile (all other members of genus Bacillus are motile) Arranged singly, in pairs or in sho chains Capsulated - entire chain being surrounded by a capsule. - Capsule is polypeptide Sporing - Spores are formed in culture or in soil but never in animal body during life. Chain of bacilli presents a bamboo stick appearance.