First documented case of equine brucellosis in Libya: a case report.

Overview

• This study reports the first confirmed case of equine brucellosis in Libya, diagnosed in a 6-year-old Thoroughbred horse showing signs of muscle and joint inflammation.
• The infection was identified via serological testing and blood culture, and successfully treated with antibiotic therapy, highlighting the broader implications for animal and public health.

Background and Significance

• Brucellosis is a contagious bacterial disease caused by Brucella species, primarily affecting livestock but capable of infecting multiple animal species including horses.
• It is zoonotic, meaning it can be transmitted from animals to humans, thus posing significant public health risks.
• Prior to this case report, equine brucellosis had not been documented in Libya, marking this case as the first known incidence in the country.

Clinical Presentation and Diagnosis

• The infected horse was a 6-year-old male Thoroughbred presenting with:
  • Muscle and joint pain
  • Inflammation over the shoulders with a pulpy texture, clinically referred to as “fistulous withers”
  • Signs of systemic infection such as stress and fatigue
• Diagnosis involved:
  • Serological agglutination testing revealing antibody titers of 1/80 for Brucella melitensis and 1/160 for Brucella abortus, indicating exposure to these bacteria
  • Blood culture that isolated Gram-negative coccobacilli characteristic of Brucella species
• These diagnostic results confirmed the presence of brucellosis in the horse, making this a novel and significant finding for Libyan veterinary medicine.

Treatment and Clinical Outcome

• The horse was treated with a combination antibiotic therapy consisting of:
  • Rifampicin
  • Doxycycline
• Following three weeks of therapy:
  • The inflammation and local lesions resolved
  • Systemic signs of infection such as fatigue and stress diminished substantially
  • The horse’s appetite returned to normal, indicating recovery
• This successful treatment highlights the effectiveness of the chosen antibiotics against Brucella infection in horses.

Implications for Animal and Public Health

• The discovery of brucellosis in a horse emphasizes the pathogen’s ability to cross species barriers, potentially affecting various domestic and wild animal populations.
• This interspecies transmission elevates the risk of zoonotic spread to humans, particularly those in close contact with infected animals.
• The case underlines the need for:
  • A “One Health” approach integrating veterinary, environmental, and human health sectors to manage brucellosis effectively.
  • Implementation of vaccination programs targeting susceptible domestic animals to reduce spread.
  • Improvement of diagnostic infrastructure in Libya to enable early detection and control of brucellosis across species.
  • International collaboration for surveillance, research, and prevention strategies given the transboundary nature of the disease.

Conclusion

• This first recorded case of equine brucellosis in Libya provides crucial evidence of expanding Brucella infections among diverse animal hosts in the region.
• The findings advocate for comprehensive and coordinated efforts aimed at controlling brucellosis to safeguard both animal welfare and human health.
• Future actions include enhanced surveillance, veterinarian training, targeted treatment protocols, and public awareness campaigns.