A bacterial cause accounts for 2%-10% of acute rhinosinusitis cases.

Nose and nasal cavities. Image source: Wikipedia, public domain.

Recommendations for Management of Acute Bacterial Sinusitis by the Infectious Diseases Society of America (IDSA):

Bacterial rather than viral rhinosinusitis should be diagnosed when any of the following occurs:

- persistent symptoms lasting at least 10 days, without improvement
- symptoms or high fever and purulent nasal discharge or facial pain for 3–4 days at illness onset
- worsening symptoms after an initial respiratory infection, lasting 5–6 days, has started to improve.

Empirical therapy should be started as soon as acute bacterial rhinosinusitis is diagnosed clinically.

Amoxicillin-clavulanate, instead of amoxicillin alone, is recommended for both children and adults.

Macrolides and trimethoprim-sulfamethoxazole are not recommended as empirical therapy, because of high rates of antimicrobial resistance.

References:

Algorithm for the management of acute bacterial rhinosinusitis (figure)
Guideline Issued for Managing Acute Bacterial Rhinosinusitis - Physician's First Watch http://bit.ly/TGn6aM
IDSA Clinical Practice Guideline for Acute Bacterial Rhinosinusitis in Children and Adults http://bit.ly/TGnaHB

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