title: Pathogenic bacterial flora in the upper respiratory tract of healthy students. Prevalence and relationship to nasopharyngeal inflammatory symptoms.
mesh_terms: D005260:Female; D006193:Haemophilus influenzae / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D009664:Norway; D009666:Nose / Q000382:microbiology*; D010033:Otitis Media / Q000453:epidemiology; D010614:Pharynx / Q000382:microbiology*; D012141:Respiratory Tract Infections / Q000209:etiology*; D012852:Sinusitis / Q000453:epidemiology; D013291:Streptococcus / Q000302:isolation & purification; D013297:Streptococcus pyogenes / Q000302:isolation & purification; D013334:Students; D013997:Time Factors