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*Manifestation varies from subclinical to severe systemic infections
 
*Manifestation varies from subclinical to severe systemic infections
 
*Intestinal infections often subclinical and persistent
 
*Intestinal infections often subclinical and persistent
*Human infections usualy acquired from infected birds, causing psittacosis or ornthosis, causing respiratory infections
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*Human infections usualy acquired from infected birds, causing psittacosis or ornithosis, causing respiratory infections
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*Causes notifiable psittacosis in birds
 
*Causes notifiable psittacosis in birds
 +
*Epidemiology:
 +
**Many wild and domestic birds susceptible
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**Organisms present in respiratory secretions and faeces of infected birds
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**Infection via inhalation or ingestion
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**Subclinical infection common
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**Intermittent shedding for prolonged periods
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**Stress precipitates disease outbreaks
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*Clinical signs:
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**Generalised infection affecting intestinal and respiratory tracts
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**Up to 10 day incubation period
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**Loss of condtion, oculonasal discahrge, diarrhoea and respiratory distress depending on strain
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**Hepatomegaly, airsacculitis and peritonitis
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*Diagnosis: stained smears, immunohistochemistry, ELISA, PCR, isolation, antibody detection by ELISA and complement fixation
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*Treatment: tetracyclines for several weeks
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*Control: quaranteen imported birds and give tetracyclines; good husbandry
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*Zoonotic by aerosol infection - can cause systemic disease with pneumonia, meningitis or meningoencephalitis
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===''Chlamydophila pecorum''===
 
===''Chlamydophila pecorum''===
   −
*Neurological disease
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*Common inapparent intestinal infection of cattle
*Common intestinal infection of cattle
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*Conjunctivitis and arthritis
 
*Sporadic bovine encephalomyelitis:
 
*Sporadic bovine encephalomyelitis:
 
**Usually in cattle under 3 years
 
**Usually in cattle under 3 years
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**Vacular damage in brain
 
**Vacular damage in brain
 
**Serofibrinious peritonitis
 
**Serofibrinious peritonitis
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**Treat with high doses tetracyclines and tylosin
    
===Diagnosis===
 
===Diagnosis===
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