A veterinary doctor had pyrexia of unknown origin. His blood culture in special laboratory media was positive for gram-negative sho bacilli which was oxidase positive. Which one of the following is the likely organism grown in culture ?

Ans. is 'd' i.e., Brucella Spp . The clues in this question are : - Gram negative - Oxidase postive - Organism can cause pyrexia of unknown origin (PUO) - Infection is common among veterinarians. . Brucellae have all these features. - Other options can be excluded by morphological features Organism Morhology . Brucella Cocci, cocobacilli or sho bacilli - Greenwood 16th/e p. 322 . Baonella spp. Small coccobacilii - Greenwood 16th/e p. 326 . Francisella spp. Small coccobacilli - Greenwood I 6th/e p. 335 . Pasteurella spp. Coccobacilli - Greenwood 16th/e p. 326 Amongst the given options only brucella can appear as sho bacilli, all others are coccobacilli.