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Updated: May 3, 2026

Antigen-Capture Enzyme-Linked Immunosorbent Assay for Specific Detection of Mycoplasma pneumoniae
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Antigen-Capture Enzyme-Linked Immunosorbent Assay for Specific Detection of Mycoplasma pneumoniae

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Age-related clinical differences in children with Mycoplasma pneumoniae infection

Yuka Kuroda1, Hiroyuki Iijima2, Kensuke Shoji3

  • 1Department of General Pediatrics and Interdisciplinary Medicine, National Center for Child Health and Development, Tokyo, Japan; Center for Postgraduate Education and Training, National Center for Child Health and Development, Tokyo, Japan.

Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy
|May 1, 2026
PubMed

Insights

Mycoplasma pneumoniae causes pneumonia in children. Younger children with this infection experienced lower oxygen levels and more hospitalizations, indicating a higher risk of hypoxemia.

Area of Science:

  • Pediatric Infectious Diseases
  • Respiratory Medicine
  • Microbiology

Background:

  • Mycoplasma pneumoniae is a frequent cause of community-acquired pneumonia in school-aged children.
  • Clinical presentation of M. pneumoniae in younger children (<5 years) is not well-understood.

Purpose of the Study:

  • To characterize and compare the clinical features of M. pneumoniae infection in younger versus older pediatric patients.
  • To assess the risk of hypoxemia and hospitalization in different age groups.

Main Methods:

  • Retrospective cohort study of pediatric patients (<18 years) with isolated M. pneumoniae.
  • Exclusion of patients with co-infections or underlying conditions.
  • Comparison of clinical characteristics between younger (0-5 years) and older (6-17 years) children.

Main Results:

  • Younger children presented with significantly lower oxygen saturation.
  • Younger children required oxygen supplementation more frequently and had higher hospitalization rates.
  • Fever, cough, pneumonia rates, and laboratory findings were similar between age groups.

Conclusions:

  • M. pneumoniae infection in young children is associated with a higher risk of hypoxemia.
  • Despite similar clinical symptoms, younger children face increased severity and need for hospitalization.
  • Further research into age-specific management of M. pneumoniae is warranted.

Keywords:
ChildrenHypoxemiaMycoplasma pneumoniaeSchool-aged children

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