Lesson 10: Actinobacillus species

Question 1

medium-sized, non-motile, gram-negative rods (0.3 to 0.5 x 0.6 to 1.4 um)

Answer 1

Actinobacillus species

Question 2

• may be pleomorphic and frequently have a coccobacillary appearance
• facultative anaerobes
• oxidase-positive and produce urease

Answer 2

Actinobacillus species

Question 3

Species of veterinary importance grow on Macconkey agar, apart from?

Answer 3

Actinobacillus pleuropneumoniae

Question 4

produce a wide range of disease conditions in domestic animals. Commmensals on mucous membranes

Answer 4

Actinobacillus species

Question 5

can identified definitively on molecular methods

Answer 5

Actinobacillus species

Question 6

causative agent of lesion in the tongue, lymph nodes, ruminant wall, skin (cattle), skin lesion (sheep) and granulomatous mastitis (pigs)

Answer 6

A. lignieresii

Question 7

causative agent of Pleuropneumonia in pigs

Answer 7

A. pleuropneumoniae

Question 8

causative agent of Septicaemia, enteritis (foals) Septicaemia (piglets), Arthritis (pigs), Enteritis (pigs, calves), Abortion (mares)

Answer 8

A. equuli

Question 9

causative agent of Septicaemia, pneumonia (piglets, foals), pneumonia (pigs, horses)

Answer 9

A. suis

Question 10

causative agent of Epididymitis (rams), Polyarthritis (lambs)

Answer 10

A. seminis

Question 11

Actinobacillus species that colony type on blood agar is cohesive

Answer 11

A. lignieresii, A. equuli, A. suis

Question 12

Actinobacillus species that the colony type on blood agar is variable

Answer 12

A. pleuropneumoniae

Question 13

a chronic pyogranulomatous inflammation of soft tissues in cattle

Answer 13

Actinobacillosis in Cattle

Question 14

Actinobacillosis in cattle also referred to as?

Answer 14

timber tongue

Question 15

causative agent of Actinobacillosis in cattle

Answer 15

Actinobacillus lignieresii

Question 16

is a commensal of the oral cavity and the intestinal tract. potentially important lesions occur in the oesophageal groove and the retropharyngeal lymphnodes

Answer 16

A. lignieresii

Question 17

containing club colonies may be evident in tissue sections

Answer 17

Pyogranulomatous foci

Question 18

is the only organism within the genus considered to be a primary pathogen

Answer 18

Pleuropneumoniae of pigs

Question 19

causative agent of Pleuropneumonia of pigs

Answer 19

A. pleuropneumoniae

Question 20

causative agent of sleepy foal disease

Answer 20

A. equuli

Question 21

an acute, potentially fatal septicaemia of newborn foals caused by Actinobacillus equuli.

Answer 21

Sleepy foal disease

Question 22

A. equuli organism is found in the?

Answer 22

reproductive and intestinal tracts of mares

Question 23

shows RTX activity and the toxin is encoded by the EQX gene

Answer 23

Actinobacillus equuli subspecies haemolyticus

Question 24

gene that has not been demonstrated in subspecies equuli

Answer 24

EQX gene

Question 25

infection is by aerosols or possibly through skin abrasions mainly in pigs under 3 months of age but disease may occur in animals of all ages if the organism is introduced into a naive high-health herd

Answer 25

Actinobacillus suis infection of piglets