Sinusitis is an inflammatory process involving the paranasal sinuses (maxillary, frontal, ethmoid, and/or sphenoid). It is usually a bacterial complication of a viral upper respiratory tract infection (URI), occurring in about 0.5 percent of all common colds.
The causative viruses are common respiratory pathogens (such as rhinoviruses) that are seldom looked for or found. Viral sinusitis is much more common than bacterial infection of the sinuses.
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