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*Only grow in presence of living eukaryotic cells
 
*Only grow in presence of living eukaryotic cells
 
*Unable to synthesis ATP therefore require intermediates from host cells
 
*Unable to synthesis ATP therefore require intermediates from host cells
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*Grow in embyonated eggs and McCoy cells as well as animal tissues
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*Not stained by Gram stain
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*Kosters (modified Ziehl-Neelson, small red rods) or fluorescent antibody stain required for detection
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*Blue inclusions in cytoplasm of Giemsa-stained cels
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*Antigen detection kits for diagnosis from swabs
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*Reticulate body has un-crosslinked peptidoglycan, which is cross-linked to form elementary bodies
 
*Reticulate body has un-crosslinked peptidoglycan, which is cross-linked to form elementary bodies
 
*Elementary bodies released from dying host cells to infect other cells
 
*Elementary bodies released from dying host cells to infect other cells
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*Persistent infections
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*Many infections subclinical due to intracellular existence of ''chlamydia'' preventing inflammatory reactions
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*Clinical infections occur in non-natural host species
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===''Chlamydophila psittaci''===
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*Causes notifiable psittacosis in birds
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===''Chlamydophila abortus''===
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*Ovine enzootic abortion
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*Contagious ovine abortion in late pregnancy
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*Infection via ingestion or inhalation causes a bacteraemia
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*Bacteria localise in placenta and cause placentitis, leading to abortion
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*Abortion rates may reach 30%
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*Fertility not impaired
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*Survival of elementary bodies in faeces and wild birds are a source of infection from one lambing season to the next
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*Ewes may be carriers for several years
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*Venereal transmission from infected rams
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*Some immunity develops after infection, protecting ewes from subsequent disease
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*Vaccines prevent infection but will not clear infection from persistently-infected animals
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*Vaccination of ewe lambs
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===''Chlamydophila felis''===
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*Host adapted species in cats
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*Feline interstitial pneumonia and conjunctivitis
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*Diagnosis by antigen detection in ocular/nasal secretions - ELISA, PCR, Kosters, fluorescent antibody test
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*Vaccine
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===Clinical infections===
       
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