Determinants of Antibiotic Use and Bacterial Coinfection in Adults Diagnosed with Influenza
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By
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Niklas Steger
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Erik Isaksson
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Anna M. Nordenskjöld
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Simon Athlin
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March 25, 2026
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Clinical Scorecard: Determinants of Antibiotic Use and Bacterial Coinfection in Adults Diagnosed with Influenza
At a Glance
| Category | Detail |
| Condition | Influenza with potential bacterial coinfection |
| Key Mechanisms | RT-PCR for influenza diagnosis; clinical signs and biomarkers for bacterial coinfection assessment |
| Target Population | Adults ≥ 18 years presenting to the ED with clinical suspicion of influenza |
| Care Setting | Emergency Departments (EDs) |
Key Highlights
- Influenza causes significant morbidity and mortality, with bacterial coinfection contributing to up to 25% of influenza-related deaths.
- RT-PCR allows for rapid diagnosis of influenza, but bacterial cultures take longer, complicating management.
- Antibiotic overprescription is common in viral RTIs, particularly in ED settings.
- Biomarkers may better predict bacterial coinfection than clinical signs alone.
- Strengthening antibiotic stewardship is essential to combat antimicrobial resistance.
Guideline-Based Recommendations
Diagnosis
- Utilize RT-PCR for accurate influenza diagnosis.
- Assess clinical signs and biomarkers to evaluate bacterial coinfection risk.
Management
- Implement antibiotic stewardship programs to reduce unnecessary antibiotic use.
Monitoring & Follow-up
- Monitor for signs of bacterial coinfection in patients diagnosed with influenza.
Risks
- Be aware of the risk of antibiotic overuse leading to antimicrobial resistance.
Patient & Prescribing Data
Adults with confirmed influenza presenting to the ED.
Antibiotics may be initiated despite confirmed influenza due to concerns about bacterial coinfection.
Clinical Best Practices
- Use clinical and biochemical factors to guide antibiotic initiation.
- Consider the duration of illness and comorbidities when assessing patients.
References