Difference between revisions of "Arcanobacter pyogenes"
Jump to navigation
Jump to search
(Redirected page to Arcanobacterium pyogenes) |
m |
||
(7 intermediate revisions by 3 users not shown) | |||
Line 1: | Line 1: | ||
+ | ===Characteristics=== | ||
+ | *Formerly known as ''Actinomyces pyogenes'' and ''Corynebacterium pyogenes'' | ||
+ | *Small facultatively anaerobic rod | ||
+ | *Grows slowly on blood agar to produce small, white colonies surrounded by a zone of beta-haemolysis after 48 hours | ||
+ | *Produces hazy haemolysis after 24 hours; pin-point colonies after 48 hours | ||
+ | *Coryneform morphology, like Chinese characters; may be curved with slightly swollen ends | ||
+ | *Found in nasopharyngeal mucosa and genital tract of cattle, sheep, pigs | ||
− | # | + | ===Pathogenicity=== |
+ | |||
+ | *Opportunistic infections following injury or viral/mycoplasma infection in ruminants and pigs | ||
+ | *Extracellular toxins including haemolysin, proteases, DNase and neurominidase | ||
+ | *Haemolytic toxin, pyolysin, member of the thiol-activated cytolysins (pore-forming toxins); possibly cytotoxic to phagocytic cells; dermonecrotising activity | ||
+ | |||
+ | |||
+ | ===Clinical infections=== | ||
+ | |||
+ | *Suppurative infections | ||
+ | *Abscesses especially in liver | ||
+ | *Lymphadenitis, [[Bones Inflammatory - Pathology#Osteomyelitis|osteomyelitis]], peritonitis and neural abscessation | ||
+ | *Pyometra | ||
+ | *Endometritis | ||
+ | *Summer mastitis | ||
+ | *Ovine foot disease | ||
+ | *[[Joints Inflammatory - Pathology#In Sheep|Arthritis]] of sheep post-dipping; [[Joints Inflammatory - Pathology#In Pigs|arthritis in pigs]] and [[Joints Inflammatory - Pathology#In Cattle|arthritis in cattle]] | ||
+ | *Umbilical infections | ||
+ | *[[Respiratory Bacterial Infections - Pathology#Acute exudative pneumonia|Acute exudative pneumonia]] and contributes to [[Respiratory Bacterial Infections - Pathology#Enzootic pneumonia of calves|Enzootic pneumonia of calves]] | ||
+ | *May cause [[Muscles - inflammatory#Abscesses|myositis]] | ||
+ | *Unclassified ''Actinomyces'' species isolated from closed cases of [[Bursae and Tendons Inflammatory - Pathology#Poll Evil and Fistulous Withers|Poll Evil and Fistulous Withers]] | ||
+ | |||
+ | |||
+ | ===Treatment=== | ||
+ | |||
+ | *Penicillin or broad spectrum antibiotics |
Revision as of 20:02, 18 August 2008
Characteristics
- Formerly known as Actinomyces pyogenes and Corynebacterium pyogenes
- Small facultatively anaerobic rod
- Grows slowly on blood agar to produce small, white colonies surrounded by a zone of beta-haemolysis after 48 hours
- Produces hazy haemolysis after 24 hours; pin-point colonies after 48 hours
- Coryneform morphology, like Chinese characters; may be curved with slightly swollen ends
- Found in nasopharyngeal mucosa and genital tract of cattle, sheep, pigs
Pathogenicity
- Opportunistic infections following injury or viral/mycoplasma infection in ruminants and pigs
- Extracellular toxins including haemolysin, proteases, DNase and neurominidase
- Haemolytic toxin, pyolysin, member of the thiol-activated cytolysins (pore-forming toxins); possibly cytotoxic to phagocytic cells; dermonecrotising activity
Clinical infections
- Suppurative infections
- Abscesses especially in liver
- Lymphadenitis, osteomyelitis, peritonitis and neural abscessation
- Pyometra
- Endometritis
- Summer mastitis
- Ovine foot disease
- Arthritis of sheep post-dipping; arthritis in pigs and arthritis in cattle
- Umbilical infections
- Acute exudative pneumonia and contributes to Enzootic pneumonia of calves
- May cause myositis
- Unclassified Actinomyces species isolated from closed cases of Poll Evil and Fistulous Withers
Treatment
- Penicillin or broad spectrum antibiotics