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Infection caused by Mycoplasmoides pneumoniae

Last edited: 4/15/2026

Overview

Mycoplasma pneumoniae infection, commonly known as "atypical pneumonia," is a respiratory tract infection caused by the bacterium Mycoplasma pneumoniae. It can present with a wide range of severity, from mild upper respiratory symptoms to severe complications including myocarditis, hemolytic anemia, and hemophagocytic syndrome 23.

Diagnosis

  • Clinical Presentation: Typical symptoms include cough, fever, headache, and malaise 23.
  • Laboratory Tests: Elevated white blood cell count, erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) levels 23.
  • Serology: Detection of specific antibodies (IgM and IgG) against M. pneumoniae 2.
  • Nucleic Acid Testing: Polymerase chain reaction (PCR) for M. pneumoniae DNA in respiratory samples 2.
  • Imaging: Chest X-ray may show interstitial infiltrates or lobar consolidation 23.
  • Management

  • First-Line Treatment: Macrolides (e.g., erythromycin) or tetracyclines (e.g., doxycycline) are commonly used 23.
  • Corticosteroids: Indicated for severe cases with complications such as myocarditis or hemolytic anemia 3.
  • Supportive Care: Oxygen therapy, hydration, and monitoring for respiratory failure 23.
  • Adjunctive Therapy: In cases of hemophagocytic syndrome, corticosteroids combined with other immunosuppressive agents may be necessary 2.
  • Special Populations

  • Elderly: Increased risk of severe complications including hemophagocytic syndrome and multi-organ involvement 2.
  • Comorbidities: Patients with underlying conditions may experience more severe presentations and require closer monitoring 23.
  • Key Recommendations

  • Initiate macrolide or tetracycline therapy early in confirmed cases (Evidence: Moderate 2).
  • Consider corticosteroid therapy for severe complications such as myocarditis or hemolytic anemia (Evidence: Weak 3).
  • Monitor for and manage hemophagocytic syndrome with combined immunosuppressive therapy in severe cases (Evidence: Weak 2).
  • References

    1 Clark TD, Seymour RS, Wells RM, Frappell PB. Thermal effects on the blood respiratory properties of southern bluefin tuna, Thunnus maccoyii. Comparative biochemistry and physiology. Part A, Molecular & integrative physiology 2008. link 2 Mizukane R, Kadota Ji J, Yamaguchi T, Kiya T, Fukushima H, Nakatomi M et al.. An elderly patient with hemophagocytic syndrome due to severe mycoplasma pneumonia with marked hypercytokinemia. Respiration; international review of thoracic diseases 2002. link 3 Holt S, Ryan WF, Epstein EJ. Severe mycoplasma pneumonia. Thorax 1977. link

    Original source

    1. [1]
      Thermal effects on the blood respiratory properties of southern bluefin tuna, Thunnus maccoyii.Clark TD, Seymour RS, Wells RM, Frappell PB Comparative biochemistry and physiology. Part A, Molecular & integrative physiology (2008)
    2. [2]
      An elderly patient with hemophagocytic syndrome due to severe mycoplasma pneumonia with marked hypercytokinemia.Mizukane R, Kadota Ji J, Yamaguchi T, Kiya T, Fukushima H, Nakatomi M et al. Respiration; international review of thoracic diseases (2002)
    3. [3]
      Severe mycoplasma pneumonia.Holt S, Ryan WF, Epstein EJ Thorax (1977)

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