Acute Bacterial Rhinosinusitis (ABRS) - Initiate Antibiotic Therapy
For symptoms lasting more than 10 days with cough, congestion, sore throat, and fever, you should diagnose acute bacterial rhinosinusitis and initiate antibiotic therapy with amoxicillin as first-line treatment 1, 2.
Diagnostic Criteria
Your patient meets the threshold for ABRS based on persistent symptoms ≥10 days without clinical improvement 1, 2. This is one of three validated presentations that distinguish bacterial from viral rhinosinusitis:
- Persistent symptoms ≥10 days without improvement (your patient)
- Severe onset with high fever (≥39°C) and purulent discharge for 3-4 consecutive days
- "Double-sickening" pattern: initial improvement followed by worsening after 5-6 days
The combination of cloudy/colored nasal drainage PLUS either nasal congestion OR facial pain/pressure confirms acute rhinosinusitis 2. The >10-day duration without improvement shifts the diagnosis from viral to bacterial etiology.
Treatment Algorithm
First-Line Antibiotic Therapy
Prescribe amoxicillin as initial treatment 1, 3. This remains the evidence-based first choice for uncomplicated ABRS in adults.
Treatment duration: 5-7 days for standard cases 1.
Risk Stratification
Assess for risk factors that would warrant second-line therapy instead:
- Age >65 years
- Recent antibiotics (within past month)
- Recent hospitalization (past 5 days)
- Significant comorbidities
- Immunocompromised state 1
If risk factors present, initiate broader-spectrum second-line therapy and extend duration to 7-10 days 1.
Follow-Up Assessment
Reassess at 3-5 days 1:
- If improving: Complete the 5-7 day course
- If worsening or no improvement: Broaden coverage or switch to different antimicrobial class
- If still not improving after antibiotic change: Refer to specialist and consider CT/MRI for complications or alternative diagnoses 1
Symptomatic Management
Provide concurrent symptomatic relief 1, 3:
- Analgesics for pain (assess severity and treat accordingly)
- Decongestants may be offered 4
- Nasal saline irrigation
Imaging
Do not obtain radiologic imaging unless you suspect complications (orbital/intracranial involvement) or an alternative diagnosis 2, 3. Imaging does not improve diagnostic accuracy for uncomplicated ABRS and exposes patients to unnecessary radiation and cost.
Critical Pitfall
The sore throat component may tempt you toward treating this as pharyngitis, but the constellation of symptoms with >10-day duration points to ABRS as the primary diagnosis. The pharyngeal symptoms are likely secondary to postnasal drainage rather than primary bacterial pharyngitis. Don't be distracted by individual symptoms—the pattern and duration define the diagnosis 1, 2.