Lesson 10: Actinobacillus species Flashcards
medium-sized, non-motile, gram-negative rods (0.3 to 0.5 x 0.6 to 1.4 um)
Actinobacillus species
• may be pleomorphic and frequently have a coccobacillary appearance
• facultative anaerobes
• oxidase-positive and produce urease
Actinobacillus species
Species of veterinary importance grow on Macconkey agar, apart from?
Actinobacillus pleuropneumoniae
produce a wide range of disease conditions in domestic animals. Commmensals on mucous membranes
Actinobacillus species
can identified definitively on molecular methods
Actinobacillus species
causative agent of lesion in the tongue, lymph nodes, ruminant wall, skin (cattle), skin lesion (sheep) and granulomatous mastitis (pigs)
A. lignieresii
causative agent of Pleuropneumonia in pigs
A. pleuropneumoniae
causative agent of Septicaemia, enteritis (foals) Septicaemia (piglets), Arthritis (pigs), Enteritis (pigs, calves), Abortion (mares)
A. equuli
causative agent of Septicaemia, pneumonia (piglets, foals), pneumonia (pigs, horses)
A. suis
causative agent of Epididymitis (rams), Polyarthritis (lambs)
A. seminis
Actinobacillus species that colony type on blood agar is cohesive
A. lignieresii, A. equuli, A. suis
Actinobacillus species that the colony type on blood agar is variable
A. pleuropneumoniae
a chronic pyogranulomatous inflammation of soft tissues in cattle
Actinobacillosis in Cattle
Actinobacillosis in cattle also referred to as?
timber tongue
causative agent of Actinobacillosis in cattle
Actinobacillus lignieresii
is a commensal of the oral cavity and the intestinal tract. potentially important lesions occur in the oesophageal groove and the retropharyngeal lymphnodes
A. lignieresii
containing club colonies may be evident in tissue sections
Pyogranulomatous foci
is the only organism within the genus considered to be a primary pathogen
Pleuropneumoniae of pigs
causative agent of Pleuropneumonia of pigs
A. pleuropneumoniae
causative agent of sleepy foal disease
A. equuli
an acute, potentially fatal septicaemia of newborn foals caused by Actinobacillus equuli.
Sleepy foal disease
A. equuli organism is found in the?
reproductive and intestinal tracts of mares
shows RTX activity and the toxin is encoded by the EQX gene
Actinobacillus equuli subspecies haemolyticus
gene that has not been demonstrated in subspecies equuli
EQX gene
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
Actinobacillus suis infection of piglets
