Lesson 4b: Rhodococcos equi.

Question 1

bronchopneumonia and lung abscessation in foals under 6 months of age

Answer 1

Suppurative bronchopneumonia of foals

Question 2

Infection by inhalation of contaminated dust or ingestion of large numbers of R. equi results to infection of?

Answer 2

granulomatous ulcerative enterocolitis and mesenteric lymphadenitis

Question 3

Source of contamination of S.B.P in foals include;

Answer 3

1. faeces of horse, mammals & even birds

Question 4

Predisposing factors of S.B.P in foals include:

Answer 4

1. dry weather
2. low humidity
3. high animal density

Question 5

virulence of R. equi in S.B.P in foals:

Answer 5

1. large plasmid contains genes that encode vapA protein that is very important
   can be used as epidemiological marker.
2. capsular polysaccharides
3. mycolic acids in the cell wall which retard phagocytosis,
4. exoenzymes

Question 6

Clinical signs of S. B. P in foals include:

Answer 6

1. Fever
2. Anorexia
3. Signs of bronchopneumnia

Question 7

Dx of S.B.P in foals:

Answer 7

1. farm history
2. pulmonary ultrasonography
3. cytology of respiratory secretions
4. bacterial culture (blood agar and MacConkey
   agar-no growth in MacConkey)

Question 8

. Tx of S. B. P in foals: oral rifampin and macrolide comb

Answer 8

Oral rifampin & macrolide combination

Question 9

rhodococcus equi is formerly named as?

Answer 9

Corynebacterium equi

Question 10

together w/ nocardia sp & mycobacterium sp they form?

Answer 10

Actinomycetales

Question 11

Major virulence factor of R. equi that can be used as epidemiological marker

Answer 11

vapA protein