1164. Antibacterial Utilization for Febrile Illnesses and Laboratory-Confirmed Bloodstream Infections in Northern Tanzania

BACKGROUND: Antimicrobial resistance is an important cause of morbidity and mortality globally; low- and middle-income countries (LMICs) face an especially high burden. Ineffective antimicrobial prescriptions and use of broad-spectrum agents contribute to resistance. We describe antibacterial prescribing patterns in patients with febrile illnesses and bloodstream infections (BSI) in northern Tanzania. METHODS: We compared data from two hospital-based prospective cohort studies, cohort 1 (2011-2014) and cohort 2 (2016-2019), both enrolled febrile pediatric and adult inpatients in Moshi, Tanzania. Aerobic blood culture was obtained in all patients and standard methods were used to determine isolate antimicrobial susceptibility. To describe management of febrile illness, we analyzed antibacterial drug prescription prior to and after enrollment. Broad-spectrum antibacterials were categorized using published frameworks. Treatments were categorized as discordant if a blood culture isolate was not susceptible to the patient’s antibacterial regimen. We performed descriptive statistics and logistic regression to understand predictors of receiving an antibacterial. RESULTS: In total, 2,176 febrile inpatients were enrolled. Antibacterials were administered to 430 (42.0%) and 501 (45.1%) patients prior to enrollment, and 930 (89.1%) and 1,060 (93.6%) during admission in cohorts 1 and 2, respectively. Infancy and duration of fever were associated with higher antibacterial prescribing prior to enrollment (Table 2). Broad-spectrum antibacterials were administered to 548 (52.5%) in cohort 1 and 682 (60.2%) in cohort 2. Laboratory-confirmed bacteremia was detected in 87 (4%) patients. Susceptibility results were available in 73 patients; of these, 41 (56.2%) received discordant antibacterials. [Figure: see text] [Figure: see text] [Figure: see text] CONCLUSION: Antibacterials were commonly administered for febrile illness in outpatient and inpatient settings; over half of patients received broad-spectrum antibacterials. A high proportion of patients with culture-positive BSI were treated with ineffective antimicrobials. Improved laboratory diagnostics for febrile illness, antimicrobial stewardship interventions, context-specific clinical guidelines, and provider education may improve prescribing practices. DISCLOSURES: Julian Hertz, MD, Roche Diagnostics: Grant/Research Support.