What is the most common pathogen causing acute bacterial rhinosinusitis?

The most common pathogen causing acute bacterial rhinosinusitis is Streptococcus pneumoniae. This bacterium is a significant contributor to respiratory tract infections, particularly in cases where sinusitis is present. S. pneumoniae is known for its role in various infections, including pneumonia, meningitis, and otitis media, which often overlap with sinusitis. In cases of acute bacterial rhinosinusitis, this pathogen is frequently isolated in affected individuals, making it a primary target for appropriate antibiotic therapy.

Other pathogens may also be involved in rhinosinusitis; however, they do not match the prevalence of S. pneumoniae. This bacterium typically presents in patients with symptoms lasting more than 10 days or worsening after initial improvement, which aligns with the classic clinical presentation of acute bacterial rhinosinusitis. Identifying this pathogen helps guide proper treatment and management of the condition.