title: Mycoplasma pneumoniae pneumonia in the elderly.
abstract: BACKGROUND
  Mycoplasma pneumoniae is one of the most common causes of community-acquired pneumonia (CAP). This infection occurs predominantly in school-aged children and younger adults, but may also occur in the elderly.
  
  
  METHODS
  To investigate the frequency and clinical characteristics of M. pneumoniae pneumonia in the elderly, we analyzed 210 hospitalized patients with M. pneumoniae pneumonia over a 15-year period.
  
  
  RESULTS
  Thirty-two (15.2%) were 60 years of age or older. The frequencies of a comorbid illness with the age >or=60-years group were significantly higher than those of the age <60-years group (p<0.0001). The symptoms were almost identical in both age groups, but the fever magnitude was significantly lower in the age >or=60-years group than the age <60-years group (p<0.0001). One or more additional etiological factors were found more frequently in the age >or=60-years group than in the age <60-years group (37.5% vs 10.1%, p=0.0003). The diagnostic sensitivity for M. pneumoniae pneumonia using the Japanese CAP guidelines scoring system was significantly lower in the age >or=60-years group than in the age <60-years group (50% vs 90%, p <0.0001).
  
  
  CONCLUSIONS
  Our results indicate that the frequency of M. pneumoniae pneumonia in the elderly was low but not rare. The symptoms and severity of the illness from this infection were almost identical in both age groups and the mortality rate was low even in the elderly. It seems to be difficult to distinguish between M. pneumoniae pneumonia and bacterial pneumonia in the elderly.
authors.affiliation: Division of Respiratory Diseases, Department of Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan. nao@med.kawasaki-m.ac.jp
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Miyashita
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Ouchi
authors.forename: Kozo
authors.initials: K
authors.lastname: Kawasaki
authors.forename: Keiko
authors.initials: K
authors.lastname: Oda
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kawai
authors.forename: Hiroki
authors.initials: H
authors.lastname: Shimizu
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kobashi
authors.forename: Mikio
authors.initials: M
authors.lastname: Oka
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D017714:Community-Acquired Infections / Q000453:epidemiology / Q000382:microbiology; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D009177:Mycoplasma pneumoniae / Q000502:physiology*; D011019:Pneumonia, Mycoplasma / Q000453:epidemiology* / Q000382:microbiology*