Emmanuel Okello

Title(s)Associate Specialist, ANR VM: Population Health & Reprod
SchoolAssociate Vice President
Address18830 Rd 112
CA 93274
Phone559-688-1731
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    Other Positions
    Title(s)Senior Lecturer, VM: Population Health & Reproduction


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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Epidemiology of Sudan ebolavirus disease cases in Uganda, January-April, 2025. Int J Infect Dis. 2026 Aug 27; 172:109075. Mfitundinda E, Wenani D, Katumba H, Abbo G, Kobusinge JL, Mutesi C, Kwizera P, Okello EO, Namusisi AM, Nalwanga J, Ainembabazi B, Namakula OL, Kobusingye JO, Kigongo VJ, Aujo D, Aman DK, Nalweyiso MD, Achom P, Matovu N, Mutegeki M, Nakaweesi W, Namasambi S, Nakabuye M, Wobusobozi J, Namwabira A, Alupo AL, Nabatta E, Agwang W, Lugwana S, Rutogire T, Namusoosa R, Opeli W, Masaba RN, Nakaye M, Nambaziira F, Musubika C, Nakaweesa V, Gidudu S, Akunzirwe R, Zalwango JF, Ninsiima M, Eurien D, Byaruhanga A, Haggai SK, Lubwama B, Bwire G, Ebong M, Atim D, Eyu P, Nansikombi HT, Kyamwine IB, Morukileng J, Migisha R, Kwesiga B, Okello PE, Bulage L, Smith KL, Ojwang J, Wasike S, Balinandi S, Nyakarahuka L, Lutwama JJ, Kaleebu P, Nabatanzi S, Gianetti B, Kadobera D, Muruta AN, Boyd MA, Ario AR. PMID: 42660412.
      View in: PubMed   Mentions:
    2. Assessment of mpox severity and associated factors in Uganda, November 2024-February 2025. Int J Infect Dis. 2026 Sep; 170:108832. Mfitundinda E, Migisha R, Kobusingye JO, Okello EO, Wenani D, Kobusinge JL, Kwizera P, Nalwanga J, Mutesi C, Katumba H, Namakula LO, Namusisi AM, Ainembabazi B, Abbo G, Eyu P, Lukabwe I, Kwesiga B, Bulage L, Komakech A, Atim D, Kavuma P, Kaliisa R, Park I, Wasike S, Kadobera D, Ario AR. PMID: 42202897.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    3. 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 Aug; 253:106884. Wamala H, Okello E. PMID: 42025109.
      View in: PubMed   Mentions:    Fields:    Translation:Animals
    4. Stunting in Developing Countries. World Rev Nutr Diet. 2026; 129:17-30. Mwangome MK, Prentice AM, Okello E, Tapkigen J, Kathembe J, Nabwera HM. PMID: 42012288.
      View in: PubMed   Mentions:    Fields:    
    5. 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.
      View in: PubMed   Mentions:
    6. 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.
      View in: PubMed   Mentions:    Fields:    Translation:AnimalsCells
    7. 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.
      View in: PubMed   Mentions:
    8. 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.
      View in: PubMed   Mentions:
    9. 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.
      View in: PubMed   Mentions:
    10. 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.
      View in: PubMed   Mentions:    Fields:    Translation:AnimalsCells
    11. 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.
      View in: PubMed   Mentions: 2  
    12. 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.
      View in: PubMed   Mentions:    Fields:    
    13. 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  
    14. 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.
      View in: PubMed   Mentions: 1  
    15. 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: 10  
    16. 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.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    17. 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.
      View in: PubMed   Mentions: 9     Fields:    
    18. 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.
      View in: PubMed   Mentions: 7  
    19. 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.
      View in: PubMed   Mentions: 15  
    20. 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  
    21. 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  
    22. 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.
      View in: PubMed   Mentions: 2  
    23. 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  
    24. 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.
      View in: PubMed   Mentions: 3     Fields:    Translation:Animals
    25. 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.
      View in: PubMed   Mentions: 1     Fields:    Translation:Animals
    26. 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.
      View in: PubMed   Mentions: 2     Fields:    Translation:AnimalsCells
    27. 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  
    28. 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  
    29. 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  
    30. 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.
      View in: PubMed   Mentions: 6     Fields:    
    31. 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.
      View in: PubMed   Mentions: 5     Fields:    
    32. 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  
    33. 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.
      View in: PubMed   Mentions: 15     Fields:    
    34. 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  
    35. 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  
    36. 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  
    37. 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
    38. 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.
      View in: PubMed   Mentions: 25     Fields:    
    39. 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.
      View in: PubMed   Mentions: 9     Fields:    
    40. 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
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