Publications
2025
Abdelfattah EM, Ekong PS, Okello E, Chamchoy T, Karle BM, Black RA, et al. Antimicrobial drug use and its association with antimicrobial resistance in fecal commensals from cows on California dairies. Front Vet Sci. 2024;11:1504640. Link
2024
Nwanna E, Ojo R, Shafiq N, Ali A, Okello E, Oboh G. An In Silico In Vitro and In Vivo Study on the Influence of an Eggplant Fruit (Solanum anguivi Lam) Diet on Metabolic Dysfunction in the Sucrose-Induced Diabetic-like Fruit Fly (Drosophila melanogaster). Foods (Basel, Switzerland), 13(4). Link
2024
Okella H, Odongo S, Vertommen D, Okello E. Identification, Synthesis, and In Vitro Activities of Antimicrobial Peptide from African Catfish against the Extended-Spectrum Beta-Lactamase (ESBL)-Producing Escherichia coli. Pharmaceutics, 16(7). Link
2024
Ongom J, Okello H, Ferreira FC, Okello E. Association between automatic milking system parameters and intramammary infections in dairy cows at dry-off. Frontiers in Animal Science, 16. Link
2023
Morris C, Wickramasingha D, Abdelfattah EM, Pereira RV, Okello E, Maier G. Prevalence of antimicrobial resistance in fecal Escherichia coli and Enterococcus spp. isolates from beef cow-calf operations in northern California and associations with farm practices. Front Microbiol, 14: 1086203. Link
2023
Okello E, ElAshmawy WR, Williams DR, Lehenbauer TW, Aly SS. Effect of dry cow therapy on antimicrobial resistance of mastitis pathogens post-calving. Front Vet Sci, 10: 1132810. Link
2023
Okella H, Tonooka K, Okello E. A Systematic Review of the Recent Techniques Commonly Used in the Diagnosis of Mycoplasma bovis in Dairy Cattle. Pathogens, 12(9): 1178. Link
2023
Al-Mazroa Smith SJ, Kreuder AJ, Raineri RR, et al. Using zoom annotate to facilitate online focus groups in veterinary medicine education research. J Vet Med Educ. Link
2022
Ferreira FC, Martínez-López B, Okello E. Potential impacts to antibiotics use around the dry period if selective dry cow therapy is adopted by dairy herds: An example of the western US. Preventive veterinary medicine, 206: 105709. Link
2022
Chamchoy T, Okello E, Williams DR, Tonooka K, Glenn K, Maehana K, Gardner IA, Aly SS. Bayesian estimation of sensitivity and specificity of a rapid mastitis test kit, bacterial culture, and PCR for detection of Staphylococcus aureus, Streptococcus species, and coliforms in bovine milk samples. Journal of dairy science, 105(7): 6240-6250. Link
2022
Nguyen HT, Polimati H, Annam SSP, Okello E, Thai QM, Vu TY, Tatipamula VB. Lobaric acid prevents the adverse effects of tetramethrin on the estrous cycle of female albino Wistar rats. PloS one, 17(7): e0269983. Link
2022
Basbas C, Aly S, Okello E, Karle BM, Lehenbauer T, Williams D, Ganda E, Wiedmann M, Pereira RV. Effect of Intramammary Dry Cow Antimicrobial Treatment on Fresh Cow's Milk Microbiota in California Commercial Dairies. Antibiotics (Basel, Switzerland), 11(7). Link
2022
Aly SS, Okello E, ElAshmawy WR, Williams DR, Anderson RJ, Rossitto P, Tonooka K, Glenn K, Karle B, Lehenbauer TW. Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Clinical Mastitis and Culling Outcomes. Antibiotics (Basel, Switzerland), 11(7). Link
2022
Abdelfattah EM, Ekong PS, Okello E, Williams DR, Karle BM, Lehenbauer TW, Aly SS. Factors Associated with Antimicrobial Stewardship Practices on California Dairies: One Year Post Senate Bill 27. Antibiotics (Basel, Switzerland), 11(2). Link
2022
ElAshmawy WR, Okello E, Williams DR, Anderson RJ, Karle B, Lehenbauer TW, Aly SS. Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Milk Production and Somatic Cell Count Outcomes. Vet Sci, 9(10): 559. Link
2022
Okella H, Okello E, Mtewa AG, Ikiriza H, Kaggwa B, Aber J, Ndekezi C, Nkamwesiga J, Ajayi CO, Mugeni IM, Ssentamu G, Ochwo S, Odongo S, Tolo CU, Kato CD, Engeu PO. ADMET profiling and molecular docking of potential antimicrobial peptides previously isolated from African catfish, Clarias gariepinus. Front Mol Biosci, 9: 1039286. Link
2021
Sheedy DB, Okello E, Williams DR, Precht K, Cella E, Lehenbauer TW, Aly SS. Effect of Antimicrobial Treatment on the Dynamics of Ceftiofur Resistanc`e in Enterobacteriaceae from Adult California Dairy Cows. Microorganisms, 9(4): 828. Link
2021
Abdelfattah EM, Ekong PS, Okello E, Chamchoy T, Karle BM, Black RA, Sheedy D, ElAshmawy WR, Williams DR, Califano D, Tovar LFD, Ongom J, Lehenbauer TW, Byrne BA, Aly SS. Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows. PeerJ, 9: e11108. Link
2021
Abdelfattah EM, Ekong PS, Okello E, Williams DR, Karle BM, Rowe JD, et al. 2019 survey of antimicrobial drug use and stewardship practices in adult cows on california dairies: post senate bill 27. Microorganisms. 2021 Jul 14;9(7). Link
2021
Opio LG, Abdelfattah EM, Terry J, Odongo S, Okello E. Prevalence of Fascioliasis and Associated Economic Losses in Cattle Slaughtered at Lira Municipality Abattoir in Northern Uganda. Animals (Basel), 11(3). Link
2021
Ekong PS, Abdelfattah EM, Okello E, Williams DR, Lehenbauer TW, Karle BM, Rowe JD, Aly SS. 2018 Survey of factors associated with antimicrobial drug use and stewardship practices in adult cows on conventional California dairies: immediate post-Senate Bill 27 impact. PeerJ, 9:e11596. Link
2021
Ekong PS, Abdelfattah EM, Okello E, Williams DR, Lehenbauer TW, Karle BM, Rowe JD, Marshall ES, Aly SS. 2018 Survey of antimicrobial drug use and stewardship practices in adult cows on California dairies: post-Senate Bill 27. PeerJ, 9:e11515. Link
2021
Okello E, Williams DR, ElAshmawy WR, Adams J, Pereira RV, Lehenbauer TW, Aly SS. Survey on Antimicrobial Drug Use Practices in California Preweaned Dairy Calves. Front Vet Sci, 8: 636670. Link
2021
Okello E, Moonens K, Erume J and De Greve H. Orally Fed Recombinant Lactococcus lactis Displaying SurfaceAnti-Fimbrial Nanobodies Protects Piglets against Escherichia coli Causing Post-Weaning Diarrhea. Agriculture, 11(186). Link
2021
Cella E, Okello E, Rossitto PV, Cenci-Goga BT, Grispoldi L, Williams DR, Sheedy DB, Pereira R, Karle BM, Lehenbauer TW, Aly SS. Estimating the Rates of Acquisition and loss of Resistance of Enterobacteriaceae to Antimicrobial Drugs in Pre-Weaned Dairy Calves. Microorganisms (October 6, 2021), 9(10): 2103. Link
2021
Palmer GH, Baym M, De La Fuente C, Bard JD, Gomez-Chiarri M, Lhermie G, Malani P, Mylonakis E, Okeke IN, Okello E, Sertkaya A, Soupir M, Stergachis A, Wilson ME, Zhang Q. Combating Antimicrobial Resistance and Protecting the Miracle of Modern Medicine. National Academies of Sciences, Engineering, and Medicine: Consensus Study Report. Link
2020
Maier G, Samah F, Garzan A, Fausak ED, Van Noord M, Okello E, Angelos J. Protocol for a Scoping/Systematic Review: Non-antimicrobial approaches for the prevention or treatment of infectious bovine keratoconjunctivitis applicable to cow-calf operations. eScholarship. Link
2019
Jenkins SN, Okello E, Rossitto PV, Lehenbauer TW, Champagne J, Penedo MCT, Arruda AG, Godden S, Rapnicki P, Gorden PJ, Timms LL, Aly SS. Molecular epidemiology of coagulase-negative Staphylococcus species isolated at different lactation stages from dairy cattle in the United States. PeerJ, 7: e6749. Link
2019
Pereira R, Williams DR, Rossitto P, Adaska J, Okello E, Champagne J, Lehenbauer TW, Li X, Chase J, Nguyen T, Pires AFA, Atwill ER, Aly SS. Association between herd management practices and antimicrobial resistance in Salmonella spp. from cull dairy cattle in Central California. PeerJ, 7: e6546. Link
2015
Okello E, Moonens K, Erume J, De Greve H. Enterotoxigenic Escherichia coli strains are highly prevalent in Ugandan piggeries, but disease outbreaks are masked by antibiotic prophylaxis. Tropical animal health and production, 47(1): 117-22. Link
2015
Moonens K, Van den Broeck I, Okello E, Pardon E, De Kerpel M, Remaut H, De Greve H. Structural insight in the inhibition of adherence of F4 fimbriae producing enterotoxigenic Escherichia coli by llama single domain antibodies. Veterinary research, 46: 14. Link
2015
Okello E, Amonya C, Okwee-Acai J, Erume J, De Greve H. Analysis of performance, management practices and challenges to intensive pig farming in peri-urban Kampala, Uganda. International Journal of Livestock Production, 6(1): 1-7. Link
2014
Nabwowe J, Kirya M, Okello E, Nanteza A. Allele Frequency of 15 Short Tandem Repeats (STR) in a Buganda Population (Central Uganda): Forensic Utility and Parentage Testing. Journal Forensic Research, 5(2). Link
2007
Okwee-Acai J, Wampande E, Hyeroba D, Okech SG, Okello E, Acon J. Small Intestinal Obstruction and Perforation by Undigested Straw and Cortical Bone in a Captive Lion Cub: A Case Report. Animal Production Research Advances, 3(4): 282-286. Link