381 - Extension Contribution to Anaplasmosis Surveillance in Arkansas: A Story of Collaboration

The emergence of resistant bacteria forced the medical and animal agriculture communities to rethink how antibiotics are used. In Arkansas, medicated feed is mostly used to treat or control Anaplasmosis in beef cattle herds. Bovine Anaplasmosis is a tick-borne disease caused by the rickettsial bacteria, Anaplasma marginale. This disease causes over $300 million in losses annually for the U.S. cattle industry. With beef cattle being the fifth largest agricultural commodity in Arkansas, it is important to know the prevalence of Anaplasmosis infection in the state. The project described is a collaborative effort between the University of Arkansas-Fayetteville campus, the University of Arkansas Extension, and the Kansas State University (KSU) College of Veterinary Medicine. Extension agents from 33 Arkansas counties were trained to recruit producers for the study and to coordinate sample collection. On the day of blood collection, Extension agents discussed the purpose of the project and appropriate disclosures with the producers. A total of 578 mature beef cattle were randomly selected from six geographical regions for sampling between the months of November 2019 and February 2020. Both whole blood and serum samples were collected from each animal. PCR testing was completed at the KSU College of Veterinary Medicine, while cELISA testing was completed by the University of Arkansas Veterinary Diagnostic Laboratory. Blood samples from 335 cattle (58.7%) were positive for Anaplasmosis on at least one test with the majority of animals testing positive (229, 68.4%) on both the cELISA and PCR tests. Rates of regional prevalence ranged from 36.7% to 93.8%. The overall results were discussed with Extension agents via Zoom prior to discussing results with individual producers. Data from this study were added to previous surveillance data collected by Kansas State University and will direct Extension education efforts pertaining to Anaplasmosis management in regional beef cattle herds.