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Wednesday, October 22, 2025: 11:30 AM Background: Serious adverse events (SAEs) related to ceftriaxone, a widely used cephalosporin antibiotic, are considered rare. After a 2024 SAE cluster in Alabama, the Centers for Disease Control and Prevention (CDC), with state/local partners and the US Food and Drug Administration (FDA), conducted a nationwide investigation of SAEs, including deaths, among patients who received ceftriaxone.Table.Clinical summary of serious adverse event cases (n=26), September 2024–June 2025Abbreviations: SAE: serious adverse event, ACH: acute care hospital, ED: emergency department, OP: outpatient clinic, F: female, M: male, Pt: patient (used when sex not reported); NR: not reported, NOS: not otherwise specified, EKG: electrocardiogram, PEA: pulseless electrical activity, IV: intravenous, IM: intramuscular, N/A: not applicable, PMH: past medical history, CA: cancer, CAD: coronary artery disease, CHF: congestive heart failure, CKD/ESRD: chronic kidney disease or end stage renal disease; COPD: chronic obstructive pulmonary disease, DM: diabetes mellitus, HTN: hypertension, HLD: hyperlipidemia, dx: disease CPR: cardiopulmonary resuscitation.Figure 1a-b.Epidemic curve: Frequency of reported serious adverse event cases following ceftriaxone administration from September 2024 to June 2025, by event month and US region (a) or ceftriaxone manufacturer (b), n=26Figure includes SAEs meeting CDC case definition: Adverse events following injectable ceftriaxone exposure, occurring after September 1, 2024, which: 1) occurred within 6 hours after receipt of injectable ceftriaxone in a non-ICU setting, 2) resulted in death or required cardiopulmonary resuscitation (CPR), and 3) were not attributed by the treating provider(s) to a cause other than ceftriaxone administration (such as known infection, other underlying medical condition, or exposure to a medication or medical product other than ceftriaxone). Figure 1a (left) displays epidemic curve by US Census Bureau region, reflecting case-patient ... |