Infectious abortion is a major flock health problem faced by sheep farmers and has a significant impact on production. Chlamydia abortus (C. abortus) is the most commonly diagnosed infectious cause of abortion in sheep in the UK and accounts for 44% of diagnosed cases. The disease Abortions due to C. abortus typically occur in the last few weeks of pregnancy. The first indication of disease is often a stillborn lamb two to three weeks prior to the expected lambing date but infection can result in full-term stillborn or weakly lambs and it is not uncommon for an affected ewe to produce a dead lamb and one or more live lambs.
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