Effects of bites by the European adder (Vipera berus) in seven Swedish horses.

The research article examines the effects of bites by the European adder (Vipera berus) on seven horses and compares the findings with existing data. The research found varied reactions to the bites, ranging from local swelling and mild systemic signs to severe symptoms, including systemic inflammatory response, severe tissue necrosis, ventricular tachycardia, and dysphagia. Treatment with ‘Zagreb’ antiserum was given to two horses while three untreated horses were euthanased due to complications arising from the bites.

Overview of the Study

• The study was focused on analyzing the effects of European adder (Vipera berus) bites on seven horses. The aim was to observe and document the physiological and clinical responses following the encounter.
• The researchers gathered data on each horse’s symptoms. This ranged from minor signs such as local swelling to severe systemic reactions including inflammation, tissue necrosis, rapid heart rate, and swallowing difficulties.

Findings of the Study

• The reactions to the adder bites were diverse – from local swelling and mild systemic reactions to severe systemic symptoms. Severity of the responses generally relates to the amount of venom injected and the horse’s reaction to it.
• Systemic inflammatory response is one reaction where the horse’s body tries to protect itself but ends up causing inflammation throughout. Symptoms include fever, increased heart and respiratory rates, and abnormal white cell counts.
• Severe tissue necrosis refers to localized death of tissue due to lack of blood supply caused by the bite.
• Ventricular tachycardia is a rapid heart rate that originates from the lower chambers of the heart. Dysphagia is difficulty in swallowing, which may be a result of localized swelling or systemic reactions

Management of Bites and Consequences

• Two of the affected horses were treated with the ‘Zagreb’ antiserum, a therapeutic agent bred to neutralize the venom released by the adder. This suggests that such treatment can be effective when administered promptly.
• The remaining three untreated horses were euthanased due to complications related to the bites, indicating the severe consequences these bites can have. It may be that the severity of reactions in these instances was beyond the point where intervention could have been effective.
• This finding shows the urgency for adequate and immediate treatment post-bite to prevent severe health effects and even death.