European outbreak of atypical myopathy in the autumn 2009.

This research article focuses on the 2009 outbreak of atypical myopathy (an acute, severe muscle disease) in grazing horses across various European countries, discussing the geographic, demographic, and clinical data of the cases reported, and offers a comparative overview of this specific outbreak compared to previous ones.

What is Atypical Myopathy?

• Atypical myopathy is defined as an acute, severe muscle disease—rhabdomyolysis—that impacts grazing horses. It’s a serious condition that terms to result in significant muscle damage, accompanied by symptoms such as muscle weakness, stiffness, and a general state of fatigue.

The 2009 Outbreak

• In October 2009, a new outbreak of atypical myopathy was reported across several European countries. The research indicates that only 25% of the horses affected by the condition survived the outbreak, highlighting the severity of this affliction.
• Clinical signs of the disease in this outbreak commonly noted among the afflicted horses were congested mucous membranes, shortness of breath (dyspnea), accelerated heart rate (tachycardia), general signs of distress such as depression and weakness, stiffness, inability to rise (recumbency), trembling, sweating, and the release of muscle proteins into the urine (myoglobinuria).
• The research found that horses which didn’t survive were significantly more likely to be recumbent, or unable to rise, than surviving horses.

Comparative Analysis and Preventive Measures

• The researchers compared the 2009 outbreak of atypical myopathy with previous outbreaks, indicating that there were noticeable differences from one outbreak to another.
• The researchers also discussed the potential prognostic factors, treatment measures to alleviate symptoms, and preventive actions for future outbreaks gleaned from the study of this outbreak.
• They underscored the need for equine practitioners (veterinarians specializing in horses), to be aware of the possibility of new cases emerging, especially following a high prevalence in the autumn, with fresh cases likely to appear in the following spring.