Changes

These bacteria only grow in the presence of living eukaryotic cells as they are unable to synthesise ATP therefore requiring intermediates from host cells. There are two morphological forms:

These bacteria only grow in the presence of living eukaryotic cells as they are unable to synthesise ATP therefore requiring intermediates from host cells. There are two morphological forms:

*Elementary body, the infective extracellular form, which is small, metabolically inert and osmotically stable; surrounded by cytoplasmic membrane, outer membrane with LPS, but no peptidoglycan

*Elementary body, the infective extracellular form, which is small, metabolically inert and osmotically stable; surrounded by cytoplasmic membrane, outer membrane with LPS, but no peptidoglycan

*Retiuculate body: larger, metabolically active, osmotically fragile

*Reticulate body: larger, metabolically active, osmotically fragile

The elementary body survives in the environment for several days.

The elementary body survives in the environment for several days.

==Pathogenesis and Pathogenicity==

==Pathogenesis and Pathogenicity==

==Species Specific Infections==

==Species Specific Infections==

===Sheep===

===Sheep===

*Sporadic or outbreaks of [[Joints Inflammatory - Pathology#In Sheep|lamb polyarthritis]]

*Sporadic or outbreaks of lamb polyarthritis

*High morbidity, low mortality

*High morbidity, low mortality

*Commonly occurs together with conjunctivitis

*Commonly occurs together with conjunctivitis

*Severe disease in young calves

*Severe disease in young calves

*High mortality

*High mortality

*Can be seen in smears of synovial fluid from [[Joints Inflammatory - Pathology#In Cattle|swollen joints]]

*Can be seen in smears of synovial fluid from swollen joints

*Oedematous and hyperaemic surrounding tissue

*Oedematous and hyperaemic surrounding tissue

*Possibly due to intrauterine infection

*Possibly due to intrauterine infection

[[Category:Chlamydophila species]]

[[Category:Chlamydophila species]]