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1,466 bytes removed ,  15:40, 25 July 2011
Redirected page to Enzootic Abortion of Ewes
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*Ovine enzootic abortion
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#redirect[[Enzootic Abortion of Ewes]]
*Especially in intensive systems
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*Ewe lambs may acquire infection at birth and abort in their first pregnancy
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[[Category:Chlamydophila_species]][[Category:Sheep Bacteria]][[Category:Cattle Bacteria]][[Category:Goat Bacteria]][[Category:Pig Bacteria]][[Category:Zoonoses]]
*Pathogenesis:
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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 late abortion or premature weak lambs
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**Necrosis of cotyledons and oedema of adjacent tissue, as well as dirty pink uterine discharge
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**Aborted lambs well preserved
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**Large numbers of chlamydiae shed in placenta and uterine discharges; survive in environment for several days
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**Abortion rates may reach 30% in susceptible flock
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**Ewes infected late in pregnancy may not abort, but may abort during the next pregnancy
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**No other clinical signs in aborting ewes
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**Fertility not impaired
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*Transmission:
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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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*Vaccination:
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**Live attenuated vaccines prior to breeding or inactivated vaccines during pregnancy
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**Vaccines prevent infection but will not clear infection from persistently-infected animals
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**Vaccination of ewe lambs prior to breeding
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*Treatment: long-acting oxytetracyclines during an outbreak to protect in-contact pregnant ewes
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*Control: isolate aborted ewes; destroy placentas, thorough cleaning
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*Also abortion in cattle, goats and pigs
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*Serious infection in pregnant women[[Category:Chlamydophila_species]][[Category:Sheep]][[Category:Cattle]][[Category:Goat]][[Category:Pig]][[Category:Zoonoses]]
 
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