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Medical, Urban, and Veterinary Entomology

Poster: MUVE, Biology and Ecology

Reaching new heights: Exploring the vertical distribution of mosquito populations on a sheep farm challenged with Cache Valley virus

Tuesday, November 11, 2025
9:00 AM - 5:00 PM Pacific
Location: Exhibit Hall A-A1, OCC
Poster Display
Cache Valley virus (CVV) is a mosquito-borne Orthobunyavirus that is a current reproductive concern for small ruminant populations and poses potential challenges to public health. The presented study investigates mosquito species composition and abundance on a farm in Booneville, Arkansas with a history of reproductive complications and CVV seroprevalence in breeding ewes. Weekly surveillance was carried out for two consecutive nights from June-October 2024 at three sites on the farm with differing habitat compositions. At each site, a CDC-CO2 trap was suspended into the canopy of a tree ranging from 8.8-12.9m from the ground. An additional CDC-CO2 trap was placed at a height of 1.5m, 6m away from the base of each tree. A total of 1302 mosquitoes were collected during the sampling period and morphologically identified to the species level, with 70.5% of specimens collected from the ground traps and 29.5% collected from the canopy traps. Out of twenty-two different species identified, the most abundant were Cx. erraticus (41.6%), Ae. vexans (18.4%), Aedes atlanticus/tormentor (13.8%), and Cx. salinarius (13.2%). CVV has historically been detected in Ae. vexans in addition to other mosquito species collected on the farm including An. quadrimaculatus, An. punctipennis, Cx. tarsalis, and Ae. triseriatus. Vector and environmental surveillance will continue in 2025 to better understand how seasonal and weather-related changes impact the vertical and horizontal distributions of mosquito populations present throughout this operation and the implications these distributions have on CVV transmission cycles.