Equine botulism and acute pasture myodystrophy: new soil-borne emerging diseases in Switzerland?

This research article focuses on the increasing cases of equine botulism and acute pasture myodystrophy, two serious horse diseases, in Switzerland over the past five years. The researchers are trying to understand the causes and treatment for these diseases and are working on vaccine development against them.

Understanding Equine Botulism and Acute Pasture Myodystrophy

• Both equine botulism and acute pasture myodystrophy are severe and often deadly diseases affecting horses.
• Equine botulism is a type of paralysis in horses caused by the toxins BoNT/C and BoNT/D produced by Clostridium botulinum types C and D.
• Major symptoms of this disease include muscle weakness and tremors, reduced tongue tone, slow chewing, salivation, difficulties swallowing, and drooping eyelids.
• Acute pasture myodystrophy is a disease characterized by rhabdomyolysis, a breakdown of muscle tissue. It affects horses that graze in frosty, windy, and rainy conditions.

Current Treatments and Challenges

• At present, horses showing signs of botulism are treated with anti-serum as quickly as possible. However, they still require intensive care, which can be challenging to provide and cost-prohibitive.
• The prognosis for horses affected by these diseases is typically guarded to poor, meaning there is only a small chance of recovery.
• As a result, prevention through maintaining high standards of forage quality and vaccination is considered of utmost importance.
• However, there is currently a lack of effective vaccines for these conditions.

Research Focus and Future Implications

• The researchers are focusing their efforts on developing a subunit vaccine for equine botulism. A subunit vaccine is a type of vaccine that uses a component of the pathogen like a protein or polysaccharide to stimulate an immune response.
• Further, the team is studying the ethiology (causes) and pathogenesis (the development of the disease) of pasture myodystrophy, aiming to improve preventative measures against this condition.
• Investigating the potential role of lethal toxins produced by Clostridium sordellii and Clostridium bifermentans in the development of pasture myodystrophy forms another core facet of this research.
• Overall, the research could be crucial in mitigating the risk these fatal diseases pose to Switzerland’s horse population and potentially to horse populations worldwide.