Emmanuel Okello • UC Davis Profiles (original) (raw)

  1. Spatial distribution and socioeconomic correlates of raw milk retail sites in California: A multi-scale analysis of global and local regression models. Prev Vet Med. 2026 Apr 18; 253:106884. Wamala H, Okello E. PMID: 42025109.
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  2. Epidemiology of Antimicrobial Residues and Phenotypic Resistance of Bacterial Isolates from Waste Milk on California Dairies. Microorganisms. 2026 Mar 10; 14(3). Mihreteab Y, Okello E, Pandey P, Abdelfattah E, Ekong PS, Sheedy D, ElAshmawy WR, Karle BM, Black RA, Williams DR, Aly SS. PMID: 41900379; PMCID: PMC13029155.
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  3. Prevalence of selected Shiga toxin-producing Escherichia coli vaccine antigen genes among two geographically distinct ruminant populations. J Med Microbiol. 2026 Mar; 75(3). Quinn C, Bruce R, Cosgrave J, Sala-Comorera L, Martin N, Burgess CM, Alexa EA, McAloon C, Frost S, Okello E, Duffy G, Aly SS, McClean S. PMID: 41855251; PMCID: PMC13002252.
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    Translation:HumansAnimalsCells
  4. Correction: Secondary metabolites from Lobaria pulmonaria (L.) Hoffm. target key metabolic enzymes: a novel strategy against multidrug-resistant tuberculosis. RSC Adv. 2026 Feb 26; 16(13):11647. Nguyen HT, Badavath VN, Maji S, Polimati H, Okello E, Bunce RA, Thuan NH, Nuzul Hakimi Wan Salleh WM, Tatipamula VB. PMID: 41777831; PMCID: PMC12951841.
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  5. Secondary metabolites from Lobaria pulmonaria (L.) Hoffm. target key metabolic enzymes: a novel strategy against multidrug-resistant tuberculosis. RSC Adv. 2026 Feb 11; 16(10):8960-8970. Nguyen HT, Badavath VN, Maji S, Polimati H, Okello E, Bunce RA, Thuan NH, Nuzul Hakimi Wan Salleh WM, Tatipamula VB. PMID: 41704445; PMCID: PMC12908696.
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  6. Analysis of Antimicrobial Residues and Resistance Profiles of Escherichia coli and Enterococcus spp. in Lagoon Water from California Dairies. Vet Sci. 2025 Oct 08; 12(10). Wang S, Aly SS, Abdelfattah E, Ekong P, Sheedy DB, ElAshmawy W, Karle BM, Black R, Williams DR, Pandey P, Okello E. PMID: 41150100; PMCID: PMC12568054.
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  7. Eggplant (Solanum spp.) Fruits Dietary Polyphenols Upregulate the Expression of Glucose Transporter Protein in Palmitate-Induced Diabetic Cell Line C2C12. Int J Mol Sci. 2025 Aug 11; 26(16). Nwanna EE, Mukwevho E, Okello E, Ayeleso AO, Ibukun EO, Oboh G. PMID: 40869081; PMCID: PMC12387005.
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    Translation:AnimalsCells
  8. Effect of Multi-Species Probiotic Supplementation on Fecal Microbiota in Pre-Weaned Holstein Dairy Calves in California. Microorganisms. 2025 Aug 02; 13(8). Lee Y, Rossow HA, Williams DR, Cheong S, Okella H, Widmer L, Okello E. PMID: 40871314; PMCID: PMC12388631.
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  9. Stunting in Developing Countries. World Rev Nutr Diet. 2025; 128:16-32. Okello E, Mwangome MK, Kathembe J, Tapkigen J, Prentice AM, Nabwera HM. PMID: 39970882.
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  10. Antimicrobial drug use and its association with antimicrobial resistance in fecal commensals from cows on California dairies. Front Vet Sci. 2024; 11:1504640. Abdelfattah EM, Ekong PS, Okello E, Chamchoy T, Karle BM, Black RA, ElAshmawy W, Sheedy D, Williams DR, Lehenbauer TW, Byrne BA, Aly SS. PMID: 39996264; PMCID: PMC11848851.
    View in: PubMed Mentions: 1
  11. Identification, Synthesis, and In Vitro Activities of Antimicrobial Peptide from African Catfish against the Extended-Spectrum Beta-Lactamase (ESBL)-Producing Escherichia coli. Pharmaceutics. 2024 Jun 22; 16(7). Okella H, Odongo S, Vertommen D, Okello E. PMID: 39065546; PMCID: PMC11279594.
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  12. 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. 2024 Feb 12; 13(4). Nwanna E, Ojo R, Shafiq N, Ali A, Okello E, Oboh G. PMID: 38397536; PMCID: PMC10888091.
    View in: PubMed Mentions: 9
  13. Using Zoom Annotate to Facilitate Online Focus Groups in Veterinary Medicine Education Research. J Vet Med Educ. 2025 Feb; 52(1):1-7. Al-Mazroa Smith SJ, Kreuder AJ, Raineri RR, Sander WE, Okello E, King AJ, Plummer PJ. PMID: 39504178.
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    Translation:Humans
  14. A Systematic Review of the Recent Techniques Commonly Used in the Diagnosis of Mycoplasma bovis in Dairy Cattle. Pathogens. 2023 Sep 19; 12(9). Okella H, Tonooka K, Okello E. PMID: 37764986; PMCID: PMC10535753.
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  15. Effect of dry cow therapy on antimicrobial resistance of mastitis pathogens post-calving. Front Vet Sci. 2023; 10:1132810. Okello E, ElAshmawy WR, Williams DR, Lehenbauer TW, Aly SS. PMID: 37546337; PMCID: PMC10399697.
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  16. 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. 2023; 14:1086203. Morris C, Wickramasingha D, Abdelfattah EM, Pereira RV, Okello E, Maier G. PMID: 36910206; PMCID: PMC9996069.
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  17. ADMET profiling and molecular docking of potential antimicrobial peptides previously isolated from African catfish, Clarias gariepinus. Front Mol Biosci. 2022; 9:1039286. 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. PMID: 36567944; PMCID: PMC9772024.
    View in: PubMed Mentions: 6
  18. Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Milk Production and Somatic Cell Count Outcomes. Vet Sci. 2022 Oct 11; 9(10). ElAshmawy WR, Okello E, Williams DR, Anderson RJ, Karle B, Lehenbauer TW, Aly SS. PMID: 36288172; PMCID: PMC9608262.
    View in: PubMed Mentions: 3
  19. Effect of Intramammary Dry Cow Antimicrobial Treatment on Fresh Cow's Milk Microbiota in California Commercial Dairies. Antibiotics (Basel). 2022 Jul 18; 11(7). Basbas C, Aly S, Okello E, Karle BM, Lehenbauer T, Williams D, Ganda E, Wiedmann M, Pereira RV. PMID: 35884217; PMCID: PMC9312063.
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  20. Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Clinical Mastitis and Culling Outcomes. Antibiotics (Basel). 2022 Jul 15; 11(7). Aly SS, Okello E, ElAshmawy WR, Williams DR, Anderson RJ, Rossitto P, Tonooka K, Glenn K, Karle B, Lehenbauer TW. PMID: 35884208; PMCID: PMC9311672.
    View in: PubMed Mentions: 6
  21. 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. Prev Vet Med. 2022 Sep; 206:105709. Ferreira FC, Martínez-López B, Okello E. PMID: 35835049.
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    Translation:Animals
  22. Lobaric acid prevents the adverse effects of tetramethrin on the estrous cycle of female albino Wistar rats. PLoS One. 2022; 17(7):e0269983. Nguyen HT, Polimati H, Annam SSP, Okello E, Thai QM, Vu TY, Tatipamula VB. PMID: 35776756; PMCID: PMC9249233.
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    Translation:Animals
  23. 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. J Dairy Sci. 2022 Jul; 105(7):6240-6250. Chamchoy T, Okello E, Williams DR, Tonooka K, Glenn K, Maehana K, Gardner IA, Aly SS. PMID: 35525615.
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    Translation:AnimalsCells
  24. Factors Associated with Antimicrobial Stewardship Practices on California Dairies: One Year Post Senate Bill 27. Antibiotics (Basel). 2022 Jan 27; 11(2). Abdelfattah EM, Ekong PS, Okello E, Williams DR, Karle BM, Lehenbauer TW, Aly SS. PMID: 35203769; PMCID: PMC8868138.
    View in: PubMed Mentions: 1
  25. Estimating the Rates of Acquisition and loss of Resistance of Enterobacteriaceae to Antimicrobial Drugs in Pre-Weaned Dairy Calves. Microorganisms. 2021 Oct 06; 9(10). Cella E, Okello E, Rossitto PV, Cenci-Goga BT, Grispoldi L, Williams DR, Sheedy DB, Pereira R, Karle BM, Lehenbauer TW, Aly SS. PMID: 34683424; PMCID: PMC8539406.
    View in: PubMed Mentions: 3
  26. 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). Abdelfattah EM, Ekong PS, Okello E, Williams DR, Karle BM, Rowe JD, Marshall ES, Lehenbauer TW, Aly SS. PMID: 34361940; PMCID: PMC8304910.
    View in: PubMed Mentions: 14
  27. 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. 2021; 9:e11596. Ekong PS, Abdelfattah EM, Okello E, Williams DR, Lehenbauer TW, Karle BM, Rowe JD, Aly SS. PMID: 34306825; PMCID: PMC8284309.
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  28. 2018 Survey of antimicrobial drug use and stewardship practices in adult cows on California dairies: post-Senate Bill 27. PeerJ. 2021; 9:e11515. Ekong PS, Abdelfattah EM, Okello E, Williams DR, Lehenbauer TW, Karle BM, Rowe JD, Marshall ES, Aly SS. PMID: 34306824; PMCID: PMC8284310.
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  29. Survey on Antimicrobial Drug Use Practices in California Preweaned Dairy Calves. Front Vet Sci. 2021; 8:636670. Okello E, Williams DR, ElAshmawy WR, Adams J, Pereira RV, Lehenbauer TW, Aly SS. PMID: 33969034; PMCID: PMC8101284.
    View in: PubMed Mentions: 13
  30. Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows. PeerJ. 2021; 9:e11108. 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. PMID: 33976962; PMCID: PMC8063881.
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  31. Effect of Antimicrobial Treatment on the Dynamics of Ceftiofur Resistance in Enterobacteriaceae from Adult California Dairy Cows. Microorganisms. 2021 Apr 14; 9(4). Sheedy DB, Okello E, Williams DR, Precht K, Cella E, Lehenbauer TW, Aly SS. PMID: 33919743; PMCID: PMC8070714.
    View in: PubMed Mentions: 5
  32. Prevalence of Fascioliasis and Associated Economic Losses in Cattle Slaughtered at Lira Municipality Abattoir in Northern Uganda. Animals (Basel). 2021 Mar 04; 11(3). Opio LG, Abdelfattah EM, Terry J, Odongo S, Okello E. PMID: 33806313; PMCID: PMC7999142.
    View in: PubMed Mentions: 23
  33. Prevalence and antifungal susceptibility of gastrointestinal candidiasis among diabetic patients: A cross-sectional study. Afr J Lab Med. 2020; 9(1):997. Oyom AP, Okello E, Acam V, Aramo C, Mwambi B, Okiria JC, Oyet C. PMID: 33354526; PMCID: PMC7736660.
    View in: PubMed Mentions: 2
  34. Assessing the prevalence and risk factors of pre-diabetes among the community of Iganga municipality, Uganda: a cross sectional study. BMC Res Notes. 2019 Aug 30; 12(1):553. Aramo C, Oyom AP, Okello E, Acam V, Okiria JC, Mwambi B, Oyet C. PMID: 31470894; PMCID: PMC6717370.
    View in: PubMed Mentions: 8 Fields:
    Translation:Humans
  35. Molecular epidemiology of coagulase-negative Staphylococcus species isolated at different lactation stages from dairy cattle in the United States. PeerJ. 2019; 7:e6749. Jenkins SN, Okello E, Rossitto PV, Lehenbauer TW, Champagne J, Penedo MCT, Arruda AG, Godden S, Rapnicki P, Gorden PJ, Timms LL, Aly SS. PMID: 31119068; PMCID: PMC6507897.
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  36. Association between herd management practices and antimicrobial resistance in Salmonella spp. from cull dairy cattle in Central California. PeerJ. 2019; 7:e6546. 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. PMID: 30923650; PMCID: PMC6431540.
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  37. Structural insight in the inhibition of adherence of F4 fimbriae producing enterotoxigenic Escherichia coli by llama single domain antibodies. Vet Res. 2015 Feb 24; 46:14. Moonens K, Van den Broeck I, Okello E, Pardon E, De Kerpel M, Remaut H, De Greve H. PMID: 25828907; PMCID: PMC4337312.
    View in: PubMed Mentions: 10 Fields:
    Translation:AnimalsCells

This graph shows the number and percent of publications by field. Fields are based on how the National Library of Medicine (NLM) classifies the publications' journals and might not represent the specific topics of the publications. Note that an individual publication can be assigned to more than one field. As a result, the publication counts in this graph might add up to more than the number of publications the person has written. To see the data as text, click here.

This graph shows the number and percent of publications by field. Fields are based on how the National Library of Medicine (NLM) classifies the publications' journals and might not represent the specific topics of the publications. Note that an individual publication can be assigned to more than one field. As a result, the publication counts in this graph might add up to more than the number of publications the person has written. To see the data as text, click here.

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