Outdoor and indoor monitoring of livestock-associated Culicoides spp. to assess vector-free periods and disease risks.
Authors: Brugger Katharina, Köfer Josef, Rubel Franz
Journal: BMC veterinary research
Summary
# Editorial Summary European livestock has faced escalating disease pressure from Culicoides-borne viruses such as Bluetongue and Schmallenberg virus over recent decades, yet regulatory frameworks require evidence-based identification of when vector transmission genuinely ceases to allow safe animal movement. Brugger and colleagues operated continuous Culicoides monitoring stations indoors and outdoors across Vienna between 2009–2013, tracking seasonal abundance patterns whilst calculating the basic reproduction number (R₀) to determine periods when disease transmission risk fell below the critical threshold of R₀ < 1. Their findings revealed distinct seasonal peaks in vector populations and identified specific windows when transmission became epidemiologically impossible, providing Austrian veterinary authorities with robust data to justify trade restrictions and their lifting in accordance with EU Regulation 1266/2007. The authors further modelled R₀ projections under climate change scenarios, suggesting future shifts in vector seasonality that could extend disease risk periods—particularly concerning for African horse sickness given warming temperatures. For equine professionals, this work underscores the importance of location-specific vector surveillance data when planning competitions, breeding movements, or import protocols, whilst highlighting that generic seasonal assumptions may become increasingly unreliable as climates shift.
Read the full abstract on PubMed
Practical Takeaways
- •Establish location-specific Culicoides monitoring to determine vector-free periods and guide quarantine/movement restriction decisions for your farm or operation
- •Use R0 calculations (<1 = safe period) to time disease risk assessments and plan breeding/trading activities around low-transmission windows
- •Monitor long-term temperature trends and seasonal patterns in your region to anticipate shifts in disease outbreak risk as climate changes
Key Findings
- •Continuous monitoring of Culicoides spp. over 5 years (2009-2013) in Vienna established seasonal vector abundance patterns both indoors and outdoors
- •Vector-free periods were identified for regulatory compliance with EU regulation 1266/2007 regarding livestock trade restrictions
- •Basic reproduction number (R0) values <1 indicate periods with no disease transmission risk for vector-borne diseases
- •Climate change projections indicate altered outbreak risks for Bluetongue and African horse sickness based on temperature-dependent vector parameters