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Burden and antimicrobial resistance of S. aureus in dairy farms in Mekelle, Northern Ethiopia.

Kalayu AA, Woldetsadik DA, Woldeamanuel Y, Wang SH, Gebreyes WA, Teferi T.

BMC Vet Res. 2020 Jan 22;16(1):20. doi: 10.1186/s12917-020-2235-8.


Clostridioides difficile on Ohio swine farms (2015): A comparison of swine and human environments and assessment of on-farm risk factors.

O'Shaughnessy RA, Habing GG, Gebreyes WA, Bowman AS, Weese JS, Rousseau J, Stull JW.

Zoonoses Public Health. 2019 Nov;66(7):861-870. doi: 10.1111/zph.12637. Epub 2019 Aug 7.


Genomic surveillance links livestock production with the emergence and spread of multi-drug resistant non-typhoidal Salmonella in Mexico.

Delgado-Suárez EJ, Ortíz-López R, Gebreyes WA, Allard MW, Barona-Gómez F, Rubio-Lozano MS.

J Microbiol. 2019 Apr;57(4):271-280. doi: 10.1007/s12275-019-8421-3. Epub 2019 Feb 5.


Off-label use of ceftiofur in one-day chicks triggers a short-term increase of ESBL-producing E. coli in the gut.

Saraiva MMS, Moreira Filho ALB, Freitas Neto OC, Silva NMV, Givisiez PEN, Gebreyes WA, Oliveira CJB.

PLoS One. 2018 Sep 11;13(9):e0203158. doi: 10.1371/journal.pone.0203158. eCollection 2018.


Short communication: Occurrence of methicillin-resistant Staphylococcus aureus and coagulase-negative staphylococci in dairy goat herds in Ohio, United States.

Moura GS, Gebreyes WA, Marques MFS, Stipp DT, Souza FN, Da Costa LB, Oliveira CJB.

J Dairy Sci. 2018 Sep;101(9):7804-7807. doi: 10.3168/jds.2017-13361. Epub 2018 Jul 13.


Phenotypic and genotypic characterization of temporally related nontyphoidal Salmonella strains isolated from humans and food animals in central Ethiopia.

Eguale T, Asrat D, Alemayehu H, Nana I, Gebreyes WA, Gunn JS, Engidawork E.

Zoonoses Public Health. 2018 Nov;65(7):766-776. doi: 10.1111/zph.12490. Epub 2018 Jul 8.


Whole genome sequencing reveals widespread distribution of typhoidal toxin genes and VirB/D4 plasmids in bovine-associated nontyphoidal Salmonella.

Delgado-Suárez EJ, Selem-Mojica N, Ortiz-López R, Gebreyes WA, Allard MW, Barona-Gómez F, Rubio-Lozano MS.

Sci Rep. 2018 Jun 29;8(1):9864. doi: 10.1038/s41598-018-28169-4.


Accuracy of PCR targeting different markers for Staphylococcus aureus identification: a comparative study using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry as the gold standard.

Saraiva MM, De Leon CM, Santos SC, Stipp DT, Souza MM, Santos Filho L, Gebreyes WA, Oliveira CJ.

J Vet Diagn Invest. 2018 Mar;30(2):252-255. doi: 10.1177/1040638717732370. Epub 2017 Nov 6.


Genetic markers associated with resistance to beta-lactam and quinolone antimicrobials in non-typhoidal Salmonella isolates from humans and animals in central Ethiopia.

Eguale T, Birungi J, Asrat D, Njahira MN, Njuguna J, Gebreyes WA, Gunn JS, Djikeng A, Engidawork E.

Antimicrob Resist Infect Control. 2017 Jan 17;6:13. doi: 10.1186/s13756-017-0171-6. eCollection 2017.


Biofilm-forming and antimicrobial resistance traits of staphylococci isolated from goat dairy plants.

Lira MC, Givisiez PE, De Sousa FG, Magnani M, De Souza EL, Spricigo DA, Gebreyes WA, De Oliveira CJ.

J Infect Dev Ctries. 2016 Sep 30;10(9):932-938. doi: 10.3855/jidc.6714.


Enterotoxin gene profile of Staphylococcus aureus isolates recovered from bovine milk produced in central Ethiopia.

Seyoum ET, Mekonene TK, Woldetsadik DA, Zewudie BM, Gebreyes WA.

J Infect Dev Ctries. 2016 Feb 28;10(2):138-42. doi: 10.3855/jidc.6797.


Fecal prevalence, serotype distribution and antimicrobial resistance of Salmonellae in dairy cattle in central Ethiopia.

Eguale T, Engidawork E, Gebreyes WA, Asrat D, Alemayehu H, Medhin G, Johnson RP, Gunn JS.

BMC Microbiol. 2016 Feb 16;16:20. doi: 10.1186/s12866-016-0638-2.


Prevalence of Listeria monocytogenes in raw bovine milk and milk products from central highlands of Ethiopia.

Seyoum ET, Woldetsadik DA, Mekonen TK, Gezahegn HA, Gebreyes WA.

J Infect Dev Ctries. 2015 Nov 30;9(11):1204-9. doi: 10.3855/jidc.6211.


Non-typhoidal Salmonella serotypes, antimicrobial resistance and co-infection with parasites among patients with diarrhea and other gastrointestinal complaints in Addis Ababa, Ethiopia.

Eguale T, Gebreyes WA, Asrat D, Alemayehu H, Gunn JS, Engidawork E.

BMC Infect Dis. 2015 Nov 4;15:497. doi: 10.1186/s12879-015-1235-y.


Supplementation with Quaternary Benzo(c)phenanthridine Alkaloids Decreased Salivary Cortisol and Salmonella Shedding in Pigs After Transportation to the Slaughterhouse.

Artuso-Ponte V, Moeller S, Rajala-Schultz P, Medardus JJ, Munyalo J, Lim K, Gebreyes WA.

Foodborne Pathog Dis. 2015 Nov;12(11):891-7. doi: 10.1089/fpd.2015.2009. Epub 2015 Sep 22.


Methicillin-Resistant Staphylococcus aureus from Brazilian Dairy Farms and Identification of Novel Sequence Types.

Oliveira CJ, Tiao N, de Sousa FG, de Moura JF, Santos Filho L, Gebreyes WA.

Zoonoses Public Health. 2016 Mar;63(2):97-105. doi: 10.1111/zph.12209. Epub 2015 Jul 14.


The use of pulsed-field gel electrophoresis for genotyping of Clostridium difficile.

Gebreyes WA, Adkins PR.

Methods Mol Biol. 2015;1301:95-101. doi: 10.1007/978-1-4939-2599-5_9.


Pre-parturition staphylococcal mastitis in primiparous replacement goats: persistence over lactation and sources of infection.

Jácome IS, Sousa FG, De Leon CM, Spricigo DA, Saraiva MM, Givisiez PE, Gebreyes WA, Vieira RF, Oliveira CJ.

Vet Res. 2014 Dec 9;45:115. doi: 10.1186/s13567-014-0115-6.


The global one health paradigm: challenges and opportunities for tackling infectious diseases at the human, animal, and environment interface in low-resource settings.

Gebreyes WA, Dupouy-Camet J, Newport MJ, Oliveira CJ, Schlesinger LS, Saif YM, Kariuki S, Saif LJ, Saville W, Wittum T, Hoet A, Quessy S, Kazwala R, Tekola B, Shryock T, Bisesi M, Patchanee P, Boonmar S, King LJ.

PLoS Negl Trop Dis. 2014 Nov 13;8(11):e3257. doi: 10.1371/journal.pntd.0003257. eCollection 2014. Review.


Phenotypic and Genotypic Characterization of Salmonella enterica in Captive Wildlife and Exotic Animal Species in Ohio, USA.

Farias LF, Oliveira CJ, Medardus JJ, Molla BZ, Wolfe BA, Gebreyes WA.

Zoonoses Public Health. 2015 Sep;62(6):438-44. doi: 10.1111/zph.12170. Epub 2014 Nov 11.


Association of multicellular behaviour and drug resistance in Salmonella enterica serovars isolated from animals and humans in Ethiopia.

Eguale T, Marshall J, Molla B, Bhatiya A, Gebreyes WA, Engidawork E, Asrat D, Gunn JS.

J Appl Microbiol. 2014 Oct;117(4):961-971. doi: 10.1111/jam.12579. Epub 2014 Jul 7.


Comparative phenotypic and genotypic analyses of Salmonella Rissen that originated from food animals in Thailand and United States.

Pornsukarom S, Patchanee P, Erdman M, Cray PF, Wittum T, Lee J, Gebreyes WA.

Zoonoses Public Health. 2015 Mar;62(2):151-8. doi: 10.1111/zph.12144. Epub 2014 Jun 16.


Distribution, quantitative load and characterization of Salmonella associated with swine farms in upper-northern Thailand.

Tadee P, Kumpapong K, Sinthuya D, Yamsakul P, Chokesajjawatee N, Nuanualsuwan S, Pornsukarom S, Molla BZ, Gebreyes WA, Patchanee P.

J Vet Sci. 2014;15(2):327-34. Epub 2014 Mar 21.


In-feed use of heavy metal micronutrients in U.S. swine production systems and its role in persistence of multidrug-resistant salmonellae.

Medardus JJ, Molla BZ, Nicol M, Morrow WM, Rajala-Schultz PJ, Kazwala R, Gebreyes WA.

Appl Environ Microbiol. 2014 Apr;80(7):2317-25. doi: 10.1128/AEM.04283-13. Epub 2014 Jan 31.


Effects of quaternary benzo(c)phenanthridine alkaloids on growth performance, shedding of organisms, and gastrointestinal tract integrity in pigs inoculated with multidrug-resistant Salmonella spp.

Robbins RC, Artuso-Ponte VC, Moeser AJ, Morrow WE, Spears JW, Gebreyes WA.

Am J Vet Res. 2013 Dec;74(12):1530-5. doi: 10.2460/ajvr.74.12.1530.


Comparative phenotypic and genotypic characterization of temporally related nontyphoidal Salmonella isolated from human clinical cases, pigs, and the environment in North Carolina.

Keelara S, Scott HM, Morrow WM, Hartley CS, Griffin DL, Gebreyes WA, Thakur S.

Foodborne Pathog Dis. 2014 Feb;11(2):156-64. doi: 10.1089/fpd.2013.1630. Epub 2013 Nov 16.


Effect of mannan oligosaccharides (Bio-Mos) and outdoor access housing on pig growth, feed efficiency and carcass composition.

Wenner BA, Zerby HN, Boler DD, Gebreyes WA, Moeller SJ.

J Anim Sci. 2013 Oct;91(10):4936-44. doi: 10.2527/jas.2013-6582. Epub 2013 Aug 13.


Longitudinal study of distributions of similar antimicrobial-resistant Salmonella serovars in pigs and their environment in two distinct swine production systems.

Keelara S, Scott HM, Morrow WM, Gebreyes WA, Correa M, Nayak R, Stefanova R, Thakur S.

Appl Environ Microbiol. 2013 Sep;79(17):5167-78. doi: 10.1128/AEM.01419-13. Epub 2013 Jun 21.


Prevalence of porcine noroviruses, molecular characterization of emerging porcine sapoviruses from finisher swine in the United States, and unified classification scheme for sapoviruses.

Scheuer KA, Oka T, Hoet AE, Gebreyes WA, Molla BZ, Saif LJ, Wang Q.

J Clin Microbiol. 2013 Jul;51(7):2344-53. doi: 10.1128/JCM.00865-13. Epub 2013 May 15.


Methicillin-resistant Staphylococcus aureus in pigs and farm workers on conventional and antibiotic-free swine farms in the USA.

Smith TC, Gebreyes WA, Abley MJ, Harper AL, Forshey BM, Male MJ, Martin HW, Molla BZ, Sreevatsan S, Thakur S, Thiruvengadam M, Davies PR.

PLoS One. 2013 May 7;8(5):e63704. doi: 10.1371/journal.pone.0063704. Print 2013.


Staphylococcus aureus shedding pattern throughout lactation in dairy cows with naturally occurring intramammary infection.

Walker JB, Walker WL, DeGraves FJ, Mathews JL, Gebreyes WA, Rajala-Schultz PJ.

J Am Vet Med Assoc. 2013 May 15;242(10):1410-8. doi: 10.2460/javma.242.10.1410.


Prevalence of Yersinia enterocolitica in antimicrobial-free and conventional antimicrobial use swine production.

Funk JA, Abley MJ, Bowman AS, Gebreyes WA, Morrow WE, Tadesse DA.

Foodborne Pathog Dis. 2013 Jun;10(6):514-9. doi: 10.1089/fpd.2012.1354. Epub 2013 Apr 24.


Molecular and biological characterization of first isolates of Hammondia hammondi from cats from Ethiopia.

Dubey JP, Tilahun G, Boyle JP, Schares G, Verma SK, Ferreira LR, Oliveira S, Tiao N, Darrington C, Gebreyes WA.

J Parasitol. 2013 Aug;99(4):614-8. doi: 10.1645/12-51.1. Epub 2013 Mar 21.


Enterotoxin-encoding genes in Staphylococcus spp. from bulk goat milk.

Lyra DG, Sousa FG, Borges MF, Givisiez PE, Queiroga RC, Souza EL, Gebreyes WA, Oliveira CJ.

Foodborne Pathog Dis. 2013 Feb;10(2):126-30. doi: 10.1089/fpd.2012.1256.


Genetic diversity of Toxoplasma gondii isolates from Ethiopian feral cats.

Dubey JP, Choudhary S, Tilahun G, Tiao N, Gebreyes WA, Zou X, Su C.

Vet Parasitol. 2013 Sep 1;196(1-2):206-8. doi: 10.1016/j.vetpar.2013.01.015. Epub 2013 Jan 24.


Yersinia enterocolitica of porcine origin: carriage of virulence genes and genotypic diversity.

Tadesse DA, Bahnson PB, Funk JA, Morrow WE, Abley MJ, Ponte VA, Thakur S, Wittum T, DeGraves FJ, Rajala-Schultz PJ, Gebreyes WA.

Foodborne Pathog Dis. 2013 Jan;10(1):80-6. doi: 10.1089/fpd.2011.1120.


Prevalence of Toxoplasma gondii from free-range chickens (Gallus domesticus) from Addis Ababa, Ethiopia.

Tilahun G, Tiao N, Ferreira LR, Choudhary S, Oliveira S, Verma SK, Kwok OC, Molla B, Saville WJ, Medhin G, Kassa T, Aleme H, Gebreyes WA, Su C, Dubey JP.

J Parasitol. 2013 Aug;99(4):740-1. doi: 10.1645/12-25.1. Epub 2012 Dec 21.


Epidemiology and genotypic characteristics of methicillin-resistant Staphylococcus aureus strains of porcine origin.

Molla B, Byrne M, Abley M, Mathews J, Jackson CR, Fedorka-Cray P, Sreevatsan S, Wang P, Gebreyes WA.

J Clin Microbiol. 2012 Nov;50(11):3687-93. doi: 10.1128/JCM.01971-12. Epub 2012 Sep 12.


Isolation of viable Toxoplasma gondii from tissues and feces of cats from Addis Ababa, Ethiopia.

Dubey JP, Darrington C, Tiao N, Ferreira LR, Choudhary S, Molla B, Saville WJ, Tilahun G, Kwok OC, Gebreyes WA.

J Parasitol. 2013 Feb;99(1):56-8. doi: 10.1645/GE-3229.1. Epub 2012 Jun 27.


A review of toxoplasmosis in humans and animals in Ethiopia.

Dubey JP, Tiao N, Gebreyes WA, Jones JL.

Epidemiol Infect. 2012 Nov;140(11):1935-8. Epub 2012 Jul 6. Review.


An investigation into the seroprevalence of Toxoplasma gondii, Bartonella spp., feline immunodeficiency virus (FIV), and feline leukaemia virus (FeLV) in cats in Addis Ababa, Ethiopia.

Tiao N, Darrington C, Molla B, Saville WJ, Tilahun G, Kwok OC, Gebreyes WA, Lappin MR, Jones JL, Dubey JP.

Epidemiol Infect. 2013 May;141(5):1029-33. doi: 10.1017/S0950268812001707. Epub 2012 Aug 2.


Antimicrobial susceptibility, pulsed-field gel electrophoresis, and multi-locus sequence typing of Campylobacter coli in swine before, during, and after the slaughter process.

Abley MJ, Wittum TE, Funk JA, Gebreyes WA.

Foodborne Pathog Dis. 2012 Jun;9(6):506-12. doi: 10.1089/fpd.2011.1053.


Variable within- and between-herd diversity of CTX-M cephalosporinase-bearing Escherichia coli isolates from dairy cattle.

Mollenkopf DF, Weeman MF, Daniels JB, Abley MJ, Mathews JL, Gebreyes WA, Wittum TE.

Appl Environ Microbiol. 2012 Jul;78(13):4552-60. doi: 10.1128/AEM.00373-12. Epub 2012 Apr 27.


Milk adulteration: Detection of bovine milk in bulk goat milk produced by smallholders in northeastern Brazil by a duplex PCR assay.

Rodrigues NP, Givisiez PE, Queiroga RC, Azevedo PS, Gebreyes WA, Oliveira CJ.

J Dairy Sci. 2012 May;95(5):2749-52. doi: 10.3168/jds.2011-5235.


Antimicrobial resistance, toxinotype, and genotypic profiling of Clostridium difficile isolates of swine origin.

Fry PR, Thakur S, Abley M, Gebreyes WA.

J Clin Microbiol. 2012 Jul;50(7):2366-72. doi: 10.1128/JCM.06581-11. Epub 2012 Apr 18.


Longitudinal analysis of the temporal evolution of Acinetobacter baumannii strains in Ohio, USA, by using rapid automated typing methods.

Decker BK, Perez F, Hujer AM, Hujer KM, Hall GS, Jacobs MR, Gebreyes WA, Zoll ST, Massire C, Eshoo MW, Ecker DJ, Rather PN, Bonomo RA.

PLoS One. 2012;7(4):e33443. doi: 10.1371/journal.pone.0033443. Epub 2012 Apr 12.


Variation in daily shedding patterns of Staphylococcus aureus in naturally occurring intramammary infections.

Walker JB, Rajala-Schultz PJ, Walker WL, Mathews JL, Gebreyes WA, DeGraves FJ.

J Vet Diagn Invest. 2011 Nov;23(6):1114-22. doi: 10.1177/1040638711425587. Epub 2011 Oct 24.


Salmonella enterica in swine production: assessing the association between amplified fragment length polymorphism and epidemiological units of concern.

Wang B, Wang C, McKean JD, Logue CM, Gebreyes WA, Tivendale KA, O'Connor AM.

Appl Environ Microbiol. 2011 Nov;77(22):8080-7. doi: 10.1128/AEM.00064-11. Epub 2011 Sep 23.


Ceftiofur use in finishing swine barns and the recovery of fecal Escherichia coli or Salmonella spp. resistant to ceftriaxone.

Lutz EA, McCarty MJ, Mollenkopf DF, Funk JA, Gebreyes WA, Wittum TE.

Foodborne Pathog Dis. 2011 Nov;8(11):1229-34. doi: 10.1089/fpd.2011.0925. Epub 2011 Aug 5.


Characterization and prevalence of a new porcine Calicivirus in Swine, United States.

Wang Q, Scheuer K, Ahang Z, Gebreyes WA, Molla BZ, Hoet AE, Saif LJ.

Emerg Infect Dis. 2011 Jun;17(6):1103-6. doi: 10.3201/eid/1706.101756.

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