title: [Streptococcus pyogenes and Mycoplasma pneumoniae: pulmonary coinfection or serologic artefact?].
abstract: BACKGROUND
  How should Mycoplasma pneumoniae seroconversion be interpreted in a patient with community-acquired Streptococcus pyogenes pneumonia?
  
  
  METHODS
  A 21-year-old man with cerebral palsy was hospitalized with acute pneumonia and fever. The bronchoalveolar lavage fluid contained Streptococcus pyogenes, and serological testing for Mycoplasma pneumoniae was positive. At 4 weeks, measurements of anti-M. pneumoniae and antistreptolysin O antibodies were positive.
  
  
  CONCLUSIONS
  Two hypotheses should be considered: the patient has either a coinfection of S. pyogenes and M. pneumoniae or a nonspecific antibody response during a severe S. pyogenes infection.
authors.affiliation: Service de réanimation médicale-assistance respiratoire, Hôpital Gui de Chauliac, 80, av. Augustin Fliche, 34295 Montpellier 5. p-corne@chu-montpellier.fr
authors.forename: Philippe
authors.initials: P
authors.lastname: Corne
authors.forename: Thibaut
authors.initials: T
authors.lastname: Grieu
authors.forename: Jonquet
authors.initials: J
authors.lastname: Olivier
mesh_terms: D000328:Adult; D000907:Antibodies, Bacterial / Q000097:blood; D016477:Artifacts; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D011019:Pneumonia, Mycoplasma / Q000150:complications* / Q000175:diagnosis*; D011018:Pneumonia, Pneumococcal / Q000097:blood / Q000150:complications* / Q000175:diagnosis*; D012698:Serologic Tests; D013297:Streptococcus pyogenes / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial