Which option best reflects the patterns that indicate acute bacterial sinusitis?

• A. All of the above.
• B. Persistent symptoms for at least 10 days without improvement.
• C. Severe onset with fever ≥39°C and purulent nasal discharge for ≥3 days.
• D. Worsening after initial improvement.

Answer: (A)

Recognizing patterns that suggest a bacterial sinus infection hinges on distinguishing when an illness yeast-like to a viral cold has progressed. Three patterns signal a bacterial contribution: symptoms lasting at least ten days without getting better, a sudden severe onset marked by a high fever (39°C or higher) with purulent nasal discharge for at least three days, and a pattern of worsening after an initial improvement (the “double-sickening” scenario). Each of these patterns reflects a shift from a typical, self-limited viral course to a bacterial process that is less likely to resolve without antibiotics. When you see any of these patterns, they collectively point to acute bacterial sinusitis, so the option that encompasses all of them is the best choice.