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Actinobacillus species (view source)
Revision as of 17:29, 17 December 2007
, 17:29, 17 December 2007no edit summary
** E.g. ''Actinobacillus lignieresii'' causes wooden tongue in cattle -> [[Muscles - inflammatory#Wooden tongue|myositis]]
** E.g. ''Actinobacillus lignieresii'' causes wooden tongue in cattle -> [[Muscles - inflammatory#Wooden tongue|myositis]]
*''A. equuli'' in [[Joints - inflammatory#In Horses|arthritis of horses]]
*''A. equuli'' in [[Joints - inflammatory#In Horses|arthritis of horses]]
===Overview===
===''Actinobacillus'' characteristics===
*Small Gram negative coccobacilli
*Oxidase negative
*Do not grow on MacConkey
===''Actinobacillus lignieresii''===
*Commensal in the mouth of sheep and cattle
*Penetrates damaged mucosa to cause a granuloma, a condition known as Actinobacillosis
*Enodogenous, sporadic and chronic infection
*Lesions in the tongue, cheek, lips and sometimes in the lower gut and lungs from aspiration
*Often spreads from the site of infection to lymphatics
*Formation of fibrous tissue in the lesions lead to hardening of the tissue, hence the condition is known as 'wooden tongue' in cattle
*In sheep abscesses with thick walls are produced
*Feeding is impaired, causing loss of condition
*Recovery with antibiotics
===''Actinobacillus equuli''===
*Commensal of the equine intestinal mucosa
*Infection at birth causes severe enteritis and septicaemia within 24 hours, known as sleepy foal disease
*In foals that survive neonatal infection the condition progresses to cause joint infections and purulent nephritis
*RTX group cytotoxin present
===''Actinobacillus suis''===