Fetoplacental pathology of equine abortion, premature birth, and neonatal loss due to Chlamydia psittaci.

The research article is about a study which confirms that Chlamydia psittaci, a type of bacteria, is a major cause of equine reproductive loss, including abortion, premature birth, and neonatal death.

Study Overview

• The researchers conducted a pathological study on the fetoplacental samples from 46 equine (horse) reproductive losses that occurred between 2015 and 2019. These losses were part of 442 equine abortion investigations.
• The losses included 7 abortions, 26 premature births, and 13 neonatal deaths with a positive result for Chlamydia psittaci, as indicated by Polymerase Chain Reaction (PCR) testing.

Major Findings

• In 83% of the cases (38 out of 46), infection with Chlamydia psittaci was considered the main cause of loss. This was confirmed using quantitative PCR (qPCR), and backed up by pathological findings and the exclusion of other potential causes. The infections were ten corroborated by immunolabeling found in lesions on the fetoplacental organ.
• The study found the presence of specific conditions indicative of Chlamydia psittaci infection like lymphohistiocytic placentitis with vasculitis, lymphohistiocytic chorionitis, lymphohistiocytic amnionitis and funisitis, and lymphohistiocytic hepatitis.
• Chlamydia psittaci was not the cause of loss in 2 cases, and in 6 cases, the significance of the infection was uncertain due to the absence of a conclusive cause of loss.

Methods Used

• The research used both qPCR and immunohistochemistry (IHC), two techniques of detecting and confirming infections. The greatest load of Chlamydia psittaci was found in pooled placental tissues, as shown by qPCR.
• The findings determined by qPCR were consistent (83% congruence) with those identified by IHC, proving the effectiveness of both methods at detecting such infections.

Conclusion

• The study concludes that Chlamydia psittaci plays a significant role in causing naturally occurring equine reproductive losses. This has implications for veterinary medicine, as it highlights the need for further study and potentially the development of targeted therapies to prevent and treat Chlamydia psittaci infections in horses.