Changes

High health status herds with lower immune challenges are more at risk then conventional herds.  Piglets from high health status herds can suddenly die without any premonitory signs. Excessive temperature fluctuation, high humidity, mixing of pigs of different ages and overcrowding may also have an important role in the development of disease.

High health status herds with lower immune challenges are more at risk then conventional herds.  Piglets from high health status herds can suddenly die without any premonitory signs. Excessive temperature fluctuation, high humidity, mixing of pigs of different ages and overcrowding may also have an important role in the development of disease.

==Clinical Signs==

==Clinical Signs==

Clinical signs vary from fever, lethargy, depression, erysipelas-like lesions, abscesses, haemorrhage, vomiting/regurgitation and lameness and multiple joint swelling.  More serious cases progress to pneumonia (clinical signs similar to [[Actinobacillus pleuropneumoniae#Clinical Signs|''A. pleuropneumoniae'') and sudden death.  Cardiorespiratory signs include tachycardia, heart murmurs, purulent or serous occulonasal discharges, sneezing, coughing, abnormal lung sounds, dyspnoea, changes in heart rate and open mouthed breathing.  Aural purulent mucoid discharge and increased amounts of wax are present along with a foul odour.  Pigs can become deaf and are often found rubbing and scratching their ears. Affected animals are in a lot of pain and discomfort and which manifests as dysphagia lymphadenopathy , anorexia, and unthriftiness.  Pregnant sows can suffer from agalactia, mastitis, abortions, still births or weak piglets.

Clinical signs vary from fever, lethargy, depression, erysipelas-like lesions, abscesses, haemorrhage, vomiting/regurgitation and lameness and multiple joint swelling.  More serious cases progress to pneumonia (clinical signs similar to [[Actinobacillus pleuropneumoniae#Clinical Signs| ''A. pleuropneumoniae'']]) and sudden death.  Cardiorespiratory signs include tachycardia, heart murmurs, purulent or serous occulonasal discharges, sneezing, coughing, abnormal lung sounds, dyspnoea, changes in heart rate and open mouthed breathing.  Aural purulent mucoid discharge and increased amounts of wax are present along with a foul odour.  Pigs can become deaf and are often found rubbing and scratching their ears. Affected animals are in a lot of pain and discomfort and which manifests as dysphagia lymphadenopathy , anorexia, and unthriftiness.  Pregnant sows can suffer from agalactia, mastitis, abortions, still births or weak piglets.

Neurological signs include head tilt, circling, temors, nystagmus, strabismus, decreased or absent menace response, ptosis, miosis or meiosis, photophobia, headshaking, opisthotonus, facial paralysis, paraparesis and ataxia.

Neurological signs include head tilt, circling, temors, nystagmus, strabismus, decreased or absent menace response, ptosis, miosis or meiosis, photophobia, headshaking, opisthotonus, facial paralysis, paraparesis and ataxia.

==Diagnosis==

==Diagnosis==