Related Experiment Video
Updated: Aug 16, 2026

Antigen-Capture Enzyme-Linked Immunosorbent Assay for Specific Detection of Mycoplasma pneumoniae
Published on: February 24, 2023
[Streptococcus pyogenes and Mycoplasma pneumoniae: pulmonary coinfection or serologic artefact?]
Philippe Corne1, Thibaut Grieu, Jonquet Olivier
1Service de réanimation médicale-assistance respiratoire, Hôpital Gui de Chauliac, 80, av. Augustin Fliche, 34295 Montpellier 5. p-corne@chu-montpellier.fr
Introduction:
How should Mycoplasma pneumoniae seroconversion be interpreted in a patient with community-acquired Streptococcus pyogenes pneumonia?
Case:
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.
Discussion:
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.
Insights
Interpreting Mycoplasma pneumoniae seroconversion requires careful consideration in patients with Streptococcus pyogenes pneumonia. A coinfection or a nonspecific antibody response are potential explanations.
Area of Science:
- Infectious Diseases
- Clinical Microbiology
- Immunology
Background:
- Pneumonia diagnosis can be complicated by co-occurring infections.
- Understanding serological markers for atypical pneumonia is crucial.
Observation:
- A case of a 21-year-old male with cerebral palsy presented with acute pneumonia.
- Bronchoalveolar lavage identified Streptococcus pyogenes.
- Serological tests indicated Mycoplasma pneumoniae infection.
Findings:
- The patient showed positive seroconversion for Mycoplasma pneumoniae alongside Streptococcus pyogenes.
- Elevated antistreptolysin O antibodies confirmed the S. pyogenes infection.
Implications:
- This case highlights the diagnostic challenge in differentiating coinfection from nonspecific antibody responses.
- Further investigation is needed to clarify the role of Mycoplasma pneumoniae in severe Streptococcus pyogenes pneumonia.
Related Concept Videos
Atypical Pneumonia
Pneumonia I: Introduction
Pneumonia I: Introduction
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Pneumonia III: Complications and Assessment
Pneumonia II: Pathophysiology
Streptococcal Pharyngitis