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===''Actinobacillus suis''===
 
===''Actinobacillus suis''===
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*Fatal septicaemia in piglets 1-8 weeks old
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*May be present in upper respiratory tract of sows
*Causes abscesses in joints and lungs of older pigs
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*Pathogenicity and clinical signs:
*Carried in the nasopharynx of pigs and nose of horses
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**Infection of piglets via aerosol or possibly skin abrasions
*Carriage may confer immunity to the more severe pleuropneumonia
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**Fatal septicaemia in piglets 1-8 weeks old
*Septicaemia and pneumonia in foals
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**Mortality up to 50% in some litters
*Pneumonia in pigs and horses
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**Fever, respiratory distress, prostration and paddling of forelimbs seen in piglets
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**Petechial and ecchymotic haemorrhages in many organs
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**Interstitial pneumonia, pleuritis, meningoencephalitis, myocarditis and arthritis
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**Causes abscesses in joints and lungs of older pigs
 +
**Carried in the nasopharynx of pigs and nose of horses
 +
**Carriage may confer immunity to the more severe pleuropneumonia
 +
*Diagnosis:
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**Specimens cultured on blood agar and MacConkey agar for 1-3 days
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**Sticky haemolytic colonies
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**Pink, lactose-fermenting colonies on MacConkey agar
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*Treatment and control:
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**Bacteria usually susceptible to ampicillin, carbenicillin, potentiated sulphonamides and tetracyclines
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**Disinfect contaminated pens
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*Other animals:
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**Septicaemia and pneumonia in foals
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**Pneumonia in pigs and horses
       
===''Actinobacillus seminis''===
 
===''Actinobacillus seminis''===
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*Epididymitis in rams
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*Epididymitis in young rams (4-8 months)
 
*Polyarthritis in lambs
 
*Polyarthritis in lambs
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*Organism found in prepuce
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*Opportunistic infection causing abscesses in epididymides
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*May be purulent discharge onto scrotal skin
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*Specimens cultured on blood agar and incubated aerobically for 1-3 days produce pin-point haemolytic colonies which are catalase-positive; no growth on MacConkey agar
     
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