title: [Refractory acute otitis media and the risk factors].
authors.forename: M
authors.initials: M
authors.lastname: Yasutomi
mesh_terms: D000208:Acute Disease; D000367:Age Factors; D000667:Ampicillin / Q000627:therapeutic use; D000668:Ampicillin Resistance; D002648:Child; D002675:Child, Preschool; D006193:Haemophilus influenzae / Q000302:isolation & purification; D006801:Humans; D007223:Infant; D009305:Nasopharynx / Q000382:microbiology; D010033:Otitis Media / Q000188:drug therapy / Q000382:microbiology / Q000503:physiopathology; D010403:Penicillin Resistance; D012307:Risk Factors; D012720:Severity of Illness Index; D013296:Streptococcus pneumoniae / Q000302:isolation & purification; D014432:Tympanic Membrane / Q000473:pathology
chemical_list: D000667:Ampicillin