Prompt and Intensive Antiviral Chemoprophylaxis in Nursing Home Influenza Outbreaks
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By
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Joe B. B. Silva
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Han-Chih T. Hsieh
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Chanelle J. Howe
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Stefan Gravenstein
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Laura A. Reich
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Andrew R. Zullo
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June 1, 2026
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Clinical Scorecard: Timely and Aggressive Antiviral Prophylaxis During Influenza Outbreaks in Long-Term Care Facilities
At a Glance
| Category | Detail |
|---|
| Condition | |
| Key Mechanisms | Postexposure prophylaxis with oseltamivir for residents not ill |
| Target Population | |
| Care Setting | |
Key Highlights
- CDC and IDSA recommend prompt postexposure prophylaxis for all residents not ill
- Chemoprophylaxis with oseltamivir has a strong (A-III) recommendation based on limited data
- Rapid initiation of chemoprophylaxis is recommended
- Study examines risks of death and hospitalization under different chemoprophylaxis strategies
- Target trial emulation used EHR data from 12 US NH corporations
Guideline-Based Recommendations
Diagnosis
Management
- Initiate chemoprophylaxis with oseltamivir for 70% or more of eligible residents within 2 days of outbreak detection as per CDC/IDSA guidelines
Monitoring & Follow-up
Risks
Patient & Prescribing Data
Residents aged 18 years or older in NHs during influenza outbreaks
Residents must not have received antiviral medication in the past 7 days or had influenza identified in the past 14 days
Clinical Best Practices
- Ensure ≥70% coverage of eligible residents for chemoprophylaxis as per CDC/IDSA guidelines
- Initiate chemoprophylaxis within 2 days of outbreak detection as per CDC/IDSA guidelines
- Monitor for all-cause death and hospitalization outcomes as per CDC/IDSA guidelines
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