Lesson 4b: Rhodococcus equi

Question 1

formerly name Corynebacterium equi

Answer 1

Rhodococcus equi

Question 2

Rhodococcus equi

Answer 2

• Gram-positive rods or cocci, aerobic, soil saprophyte, worldwide distribution
• opportunistic intracellular pathogen
• non-motile, catalase-positive, oxidase- negative and weakly acid-fast
• oxidation-fermentation test and in sugar fermentation tests negative
• CAMP-test positive
• together with nocardia sp and mycobacterium sp they form actinomycetales
• respiratory pathogen of foal

Question 3

infection by inhalation of contaminated dust or ingestion (sputum) of large numbers of R. equi result to infection granulomatous ulcerative enterocolitis and mesenteric lymphadenitis

Answer 3

suppurative bronchopneumonia of foals

Question 4

source of contamination include faeces of horse, mammals and even birds

Answer 4

suppurative bronchopneumonia of foals

Question 5

the virulence of R. equi, is principally associated with a large plasmid which contains genes that encode most importantly ________ that can be used as epidemiological marker.

Answer 5

vapA protein

Question 6

other virulence of R. equi in the cell wall which retard phagocytosis, and also a variety of exoenzymes.

Answer 6

capsular polysaccharides and mycolic acids

Question 7

clinical conditions associated with rhodococcus of Foals 1-4 months of age

Answer 7

Suppurative bronchopneumonia and pulmonary abcessation

Question 8

clinical condition associated with rhodococcus of HORSES

Answer 8

superficial abscessation

Question 9

clinical condition of pigs and cattle under rhodococcus equi.

Answer 9

mild cervical lymphadenopathy

Question 10

clinical condition associated with rhodococcus equi of Cats

Answer 10

Subcutaneous abscesses, mediastinal granulomas

Question 11

clinical condition associated with rhodococcus equi in immunosuppressed humans

Answer 11

pneumonia