Abstract
Seven horses positive for antibodies to equine infectious anemia virus in the agar gel immunodiffusion test were maintained together with 8 test-negative horses in an isolated pasture in south Louisiana for 1 year. Although the test-positive horses were inapparently infected (exhibiting no clinical signs of equine infectious anemia), 6 of the 8 test-negative horses became test-positive during 1 vector season. Canopy trap surveillance revealed Hybomitra lasiophthalma as the only tabanid species present during 2 equine infectious anemia virus transmissions in March. A high population of Tabanus lineola was present during the remaining 4 virus transmissions in July, September, and October.
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