Livestock fatalities attributed to a massive attack of Psorophora columbiae following Hurricane Laura

Authors

  • Bianca Cecco Setor de Patologia Veterinária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil, 91540-000
  • Emi Sasaki School of Veterinary Medicine, Louisiana State University, Department of Pathobiological Sciences and Louisiana Animal Disease Diagnostic Laboratory, Baton Rouge, LA 70803
  • Daniel B. Paulsen School of Veterinary Medicine, Louisiana State University, Department of Pathobiological Sciences and Louisiana Animal Disease Diagnostic Laboratory, Baton Rouge, LA 70803
  • Craig Fontenot Department of Veterinary Clinical Sciences School of Veterinary Medicine, and Agricultural Center Louisiana State University, Baton Rouge, LA 70803
  • Christine Navarre Department of Veterinary Clinical Sciences School of Veterinary Medicine, and Agricultural Center Louisiana State University, Baton Rouge, LA 70803
  • Kristen Healy Department of Entomology, LSU Agriculture Center, College of Agriculture, Louisiana State University, Baton Rouge, LA 70803
  • Ingeborg M. Langohr School of Veterinary Medicine, Louisiana State University, Department of Pathobiological Sciences and Louisiana Animal Disease Diagnostic Laboratory, Baton Rouge, LA 70803

Keywords:

massive fatalities, cattle, hemorrhage, mosquito, tropical

Abstract

The objective of this case report is to characterize the sudden fatality of livestock associated with a massive attack of dark rice field mosquitoes (Psorophora columbiae) after the passage of Hurricane Laura in southwest Louisiana late August 2020. In 3 days, approximately 30 deer, 600 beef cattle, 100 sheep and 30 horses died following a brief history of weakness or, in most cases, no clinical signs prior to death. Several on-site visits were performed by veterinarians to evaluate animals and perform necropsies. Two deer were received for necropsy, and tissue samples from 1 bull and 1 horse were evaluated at the Louisiana Animal Diagnostic Disease Laboratory. In addition, postmortem examination was performed on another 15 animals by veterinarians. Similar gross alterations were observed in all necropsies. Lesions included multifocal petechiae and ecchymoses in the skin and the subcutaneous tissues. Both deer also had pale discoloration and accentuated lobular patterns in their livers. Histologically, the livers of the deer and the bull exhibited centrilobular degeneration and hepatocyte dissociation suggestive of severe anemia. The description of this animal fatality event associated with Psorophora colum- biae attack demonstrates the need to establish prevention and/or intervention protocols in areas prone to hurricanes and tropical depressions.

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Published

2022-08-17

How to Cite

Cecco, B., Sasaki, E., Paulsen, D. B., Fontenot, C., Navarre, C., Healy, K., & Langohr, I. M. (2022). Livestock fatalities attributed to a massive attack of Psorophora columbiae following Hurricane Laura. The Bovine Practitioner, 56(1), 14–18. Retrieved from https://bovine-ojs-tamu.tdl.org/bovine/article/view/8419