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Ovine abortion
Abortion in flocks vaccinated against enzootic abortion
  1. Morag Livingstone,
  2. Kevin Aitchison and
  3. David Longbottom
  1. Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh EH26 0PZ
  1. e-mail: david.longbottom{at}moredun.ac.uk

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WE wish to report the results of a three-year investigation into the identification of the vaccinal strain in cases of abortion in sheep vaccinated with commercial live, attenuated Chlamydia abortus vaccines (Enzovax, MSD Animal Health; CEVAC Chlamydia, Ceva Santé Animale). We (Wheelhouse and others 2010) and others (Laroucau and others 2010) have recently published evidence for this live vaccine having a possible role in causing late-term abortion in vaccinated animals. As a follow-up and in cooperation with both commercial companies' ongoing pharmacovigilance (King 2011), we have continued to monitor the occurrence of the vaccinal strain in diagnosed cases of enzootic abortion of …

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