Culicoides-virus interactions: infection barriers and possible factors underlying vector competence

Area of Science:

• Veterinary Entomology
• Arbovirology
• Molecular Biology

Background:

• Culicoides midges are significant vectors of economically important arboviruses in the United States, including Bluetongue Virus (BTV) and Epizootic Hemorrhagic Disease Virus (EHDV).
• Understanding midge-virus interactions is crucial for controlling viral spread and economic losses in livestock.

Purpose of the Study:

• To review and summarize the dynamic changes in viral titer and prevalence within Culicoides midges during arbovirus infection.
• To highlight the key barriers to infection and dissemination in the midge.
• To discuss factors influencing vector competence and the potential of new molecular tools.

Main Methods:

• Literature review synthesizing existing studies on Culicoides-arbovirus interactions.
• Analysis of trends in viral titer and prevalence over the infection course.
• Identification and discussion of mesenteron infection and escape barriers.

Main Results:

• Viral dynamics within midges are complex, with significant changes in titer and prevalence over time.
• Mesenteron infection and escape barriers play a critical role in dictating viral dissemination.
• Heritable and extrinsic factors contribute to these barriers, influencing vector competence.

Conclusions:

• The review provides an overview of viral dynamics and barriers in Culicoides vectors.
• Emerging molecular tools offer new avenues to investigate factors affecting vector competence.
• Further research is needed to fully elucidate these complex interactions for improved disease management.