Acute bacterial rhinosinusitis is the mucosal inflammation of the nose and paransal sinuses caused by bacteria lasting >10 days for up to 4 weeks or symptoms worsening for 5-7 days and is <12 weeks with complete resolution of symptoms.
It is often preceded by a viral upper respiratory tract infection.
Signs and symptoms are nonspecific and typically difficult to differentiate from viral upper respiratory tract infection.
There is fever with nasal obstruction/congestion or anterior and/or posterior purulent drainage, with or without facial pressure/pain/fullness and reduction/loss of smell. Streptococcus pneumoniae and unencapsulated strains of Haemophilus influenzae cause half of acute rhinosinusitis cases.