PMID- 37104399 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230501 IS - 2306-7381 (Electronic) IS - 2306-7381 (Linking) VI - 10 IP - 4 DP - 2023 Mar 24 TI - Tetracycline, Sulfonamide, and Erythromycin Residues in Beef, Eggs, and Honey Sold as "Antibiotic-Free" Products in East Tennessee (USA) Farmers' Markets. LID - 10.3390/vetsci10040243 [doi] LID - 243 AB - Foods that contain antibiotic residues have potential adverse health effects on consumers and provide selective pressure for the threat of antimicrobial resistance (AMR). This study's objective was to measure tetracycline, sulfonamide, and erythromycin residues in beef, eggs, and honey sold as "antibiotic-free" at farmers' markets in East Tennessee (East TN) in the United States (U.S.). Between July and September 2020, 36 "antibiotic-free" food products (9 beef, 18 egg, and 9 honey products) were purchased from East TN farmers' markets and tested for tetracycline, sulfonamide, and erythromycin residues using competitive enzyme-linked immunosorbent assays (cELISA). All beef, egg, and honey products had tetracycline residue; the median concentrations were 51.75, 30.25, and 77.86 microg/kg, respectively. Sulfonamide residue was present in every sample of beef. Of 18 eggs, 11 eggs had detectable sulfonamide residue; the median concentrations were 3.50 and 1.22 microg/kg in beef and eggs, respectively. Each sample of beef and honey contained erythromycin residue; the median concentrations were 3.67 and 0.68 microg/kg, respectively. Overall, the median concentrations of tetracycline, sulfonamide, and erythromycin residues were below the maximum residue levels (MRLs) set in the U.S. for beef and eggs. Thus, the beef and eggs sold as "antibiotic-free" in East TN farmers' markets can be considered safe for consumption. Safety determination for honey could not be made because MRLs have not been set for honey in the U.S. Because these residues should not be expected in "antibiotic-free" food products, it is important to further investigate the potential sources of these residues in these products. FAU - Sarkar, Shamim AU - Sarkar S AD - Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA. FAU - Souza, Marcy J AU - Souza MJ AUID- ORCID: 0000-0002-0990-2962 AD - Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA. FAU - Martin-Jimenez, Tomas AU - Martin-Jimenez T AD - Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA. FAU - Abouelkhair, Mohamed A AU - Abouelkhair MA AD - Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA. FAU - Kania, Stephen A AU - Kania SA AUID- ORCID: 0000-0002-4490-7347 AD - Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA. FAU - Okafor, Chika C AU - Okafor CC AUID- ORCID: 0000-0002-2895-8347 AD - Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA. LA - eng PT - Journal Article DEP - 20230324 PL - Switzerland TA - Vet Sci JT - Veterinary sciences JID - 101680127 PMC - PMC10143955 OTO - NOTNLM OT - ELISA OT - East Tennessee OT - Farmers' market OT - antibiotic residues OT - antibiotic-free OT - antimicrobial resistance OT - beef OT - egg OT - erythromycin OT - honey OT - organic OT - sulfonamide OT - tetracycline COIS- The authors declare no conflict of interest. EDAT- 2023/04/27 18:41 MHDA- 2023/04/27 18:42 PMCR- 2023/03/24 CRDT- 2023/04/27 13:43 PHST- 2023/01/10 00:00 [received] PHST- 2023/03/21 00:00 [revised] PHST- 2023/03/22 00:00 [accepted] PHST- 2023/04/27 18:42 [medline] PHST- 2023/04/27 18:41 [pubmed] PHST- 2023/04/27 13:43 [entrez] PHST- 2023/03/24 00:00 [pmc-release] AID - vetsci10040243 [pii] AID - vetsci-10-00243 [pii] AID - 10.3390/vetsci10040243 [doi] PST - epublish SO - Vet Sci. 2023 Mar 24;10(4):243. doi: 10.3390/vetsci10040243.