Microorganisms detected in unilateral sinusitis.

Unilateral sinusitis includes maxillary sinusitis of dental origin, fungal maxillary sinusitis, and acute sinusitis. Microorganisms of 50 cases of unilateral maxillary sinusitis were studied. Eighty-six strains and 24 kinds of bacteria were detected. They included mainly Streptococcus pneumoniae(15.1%), Haemophilus influenzae(12.8%), Peptostreptococcus(10.5%), and Bacteroides (14%). Of the total 86 strains isolated, 41(47.7%)were aerobic and 45(52.3%) were anaerobic.Anaerobic microorganisms play a more important role in unilateral maxillary sinusitis than in bilateral sinusitis. This should be considered when selecting antibiotics for the treatment of unilateral maxillary sinusitis