Emmanuel Okello

Assistant Specialist in Cooperative Extension

Population Health & Reproduction

2006, BVM, Makerere University , Kampala, Uganda
2010, MSc, Katholieke University, Leuven, Belgium
2015, PhD, Vrije University of Brussel, Brussels, Belgium
2018, Postdoctoral training, University of California Davis,
Active Research Grants
Co-Principal Investigator, Development of an economic tool to optimize mastitis management programs in California, Fernanda C. Ferreira (Principal Investigator), CDFA
Principal Investigator, Recycled flush and lagoon water as a reservoir for antibiotic residues and resistant bacteria on dairies, (Principal Investigator), CFAH
Co-Principal Investigator, Addressing On-Farm Antimicrobial Drug Use Practices through A Community of Practice-Based Approach, Martin Smith (Principal Investigator), CDFA
Principal Investigator, Antimicrobial Stewardship Educational Outreach Program, (Principal Investigator), California Department of Food and Agriculture
Co-Principal Investigator, Improving Antimicrobial Resistance Science Communication Education for Veterinary Students, Paul Plummer (Principal Investigator), USDA-NIFA
Research Focus
International livestock health and antimicrobial resistance
Specialty Focus
Promoting the judicious use of antibiotics and control of antimicrobial resistance on California dairy herds. Working with farmers and other stakeholders to improve livestock health and productivity.
Ten Recent Publications

Chamchoy T, Okello E, Williams DR, Tonooka K, Glen K, Maehana K, Gardner I, 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

Abdelfattah EM, Ekong PS, Okello E, Williams DR, Karle BM, Lehenbauer TW and Aly SS.
Factors Associated with Antimicrobial Stewardship Practices on California Dairies: One Year Post Senate Bill 27

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.

Abdelfattah EM, Ekong PS, Okello E, Williams DR, Karle BM, Rowe JD, Marshall ES, Lehenbauer TW and Aly SS
2019 Survey of Antimicrobial Drug Use and Stewardship Practices in Adult Cows on California Dairies: Post Senate Bill 27

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.

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

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.