Detection of genotype 1 bovine leukemia virus from a C.schultzei pool: Do Culicoides spp. have a role on the transmission of bovine leukemia virus?

The research investigates the possible role of Culicoides species, a type of small fly, in the transmission of the bovine leukemia virus (BLV) in cattle. Though no definite role was established, the researchers found the same versions of BLV in both the flies and the cattle, suggesting a possible link.

Introduction

• The research focuses on the Bovine leukemia virus (BLV), the cause of Enzootic bovine leukosis (EBL), the most prevalent cancer in cattle.
• The main mode of BLV transmission is thought to be iatrogenic (through medical intervention), but the virus has also been found in a variety of biological samples and in certain insect species.
• The role of insects in BLV transmission is unclear. The study in focus investigates the possible role of a type of small fly, the Culicoides species, in the transmission.

Methodology and Findings

• In the study, BLV prevalence was analysed in 224 cattle from 27 different small family herds in southern Turkey.
• Among the cattle, 1.33% were found to have the virus. Similarly, only one out of 25 studied Culicoides species pools tested positive for the virus.
• Through phylogenetic analysis, the researchers show that the version of BLV found in both the cattle and the Culicoides species (genotype 1) was the same.

Interpretation and Further Research

• The research doesn’t establish a definitive role of the Culicoides species in the transmission of BLV; however, finding the same version of the virus in both the cattle and the midges implies a possible epidemiological relationship.
• Further studies are ongoing to explore the environmental gene and other regions of the BLV detected from cattle and the Culicoides species, to better understand the possible correlation between the two.