Acute Haemophilus influenzae bacterial sinusitis

Acute *Haemophilus influenzae* bacterial sinusitis is a localized infection and inflammation of the paranasal sinus mucosa caused by the Gram-negative bacterium *Haemophilus influenzae*, with a duration of illness lasting fewer than four weeks Pathophysiologically, the entrapped bacteria proliferate within the sinus cavities, leading to mucosal edema, purulent exudate accumulation, and characteristic symptoms including nasal congestion, purulent rhinorrhea, and facial pain or pressure

Acute *Haemophilus influenzae* bacterial sinusitis is a localized infection and inflammation of the paranasal sinus mucosa caused by the Gram-negative bacterium *Haemophilus influenzae*, with a duration of illness lasting fewer than four weeks It affects pediatric and adult populations, frequently arising as a secondary complication following a viral upper respiratory tract infection or allergic mucosal inflammation that impairs mucociliary clearance and obstructs sinus ostia

It affects pediatric and adult populations, frequently arising as a secondary complication following a viral upper respiratory tract infection or allergic mucosal inflammation that impairs mucociliary clearance and obstructs sinus ostia Pathophysiologically, the entrapped bacteria proliferate within the sinus cavities, leading to mucosal edema, purulent exudate accumulation, and characteristic symptoms including nasal congestion, purulent rhinorrhea, and facial pain or pressure

The condition is clinically defined by persistent symptoms extending beyond ten days without improvement, severe presentation such as high fever and purulent nasal discharge, or a "double-sickening" pattern of deterioration after transient initial recovery

The condition is clinically defined by persistent symptoms extending beyond ten days without improvement, severe presentation such as high fever and purulent nasal discharge, or a "double-sickening" pattern of deterioration after transient initial recovery