Overview
Alphavirus, exemplified by bluetongue virus (BTV), causes significant disease in livestock, particularly sheep and cattle, characterized by fever, swelling, and in severe cases, significant morbidity and mortality 12.Diagnosis
Clinical signs include fever, oral and nasal lesions, and swelling of the head, neck, and interdigital spaces 1.
Laboratory confirmation involves detecting viral RNA via RT-PCR or serology for specific antibodies 2.
Virus isolation from blood or tissue samples can also be performed but is less commonly used due to biosafety concerns 3.Management
No specific antiviral treatment exists; management focuses on supportive care including fluid therapy, anti-inflammatory drugs (e.g., NSAIDs), and wound care 1.
Vaccination is recommended for prevention, particularly in endemic areas, though efficacy can vary by serotype 2.Special Populations
No specific guidance provided in the abstracts regarding management differences in pregnancy, pediatric livestock, elderly animals, or those with comorbidities 123.Key Recommendations
Implement vigilant surveillance and rapid diagnostic testing in livestock populations to detect bluetongue outbreaks early 2 (Evidence: Expert opinion).
Vaccinate livestock against bluetongue virus where vaccines are available and appropriate for local serotypes 2 (Evidence: Expert opinion).
Provide supportive care including fluid therapy and anti-inflammatory treatment to manage clinical symptoms 1 (Evidence: Expert opinion).References
1 Stokstad E. Livestock virus hits Europe with a vengeance. Science (New York, N.Y.) 2024. link
2 Gibbens N. Bluetongue: vets and farmers urged to remain vigilant. The Veterinary record 2016. link
3 Wade-Evans AM, Mertens PP. Expression of the outer capsid protein, VP2, from a full length cDNA clone of genome segment 2 of bluetongue serotype 1 from South Africa, using both Sp6 and vaccinia expression systems and a comparison of the nucleic acid sequence of this segment with those of other serotypes. Virus research 1990. link90029-b)