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Risk factors for severe Chlamydia pneumoniae pneumonia in children: a retrospective case-control study
Di Hu1,2, Yingqian Zhang2,3,4, Ran Ma1,2
1Graduate School, Hebei Medical University, Shijiazhuang, Hebei, China.
Frontiers in Pediatrics
|June 22, 2026
Summary
In children with Chlamydia pneumoniae pneumonia (CPP), a lower lymphocyte percentage and elevated immunoglobulin A (IgA) are linked to severe disease. These findings may aid in identifying children at higher risk for severe CPP.
Area of Science:
- Pediatric infectious diseases
- Respiratory medicine
- Clinical microbiology
Background:
- Chlamydia pneumoniae pneumonia (CPP) is a significant cause of respiratory illness in children.
- Understanding risk factors for severe CPP is crucial for timely intervention and improved outcomes.
Purpose of the Study:
- To investigate the clinical features of CPP in children.
- To identify risk factors associated with the progression of CPP to severe pneumonia.
Main Methods:
- A retrospective study of 133 children diagnosed with CPP.
- Classification of disease severity based on established pediatric pneumonia guidelines.
- Comparison of demographic, clinical, and laboratory data between non-severe and severe CPP groups.
- Multivariate logistic regression to determine independent risk factors for severe CPP.
Main Results:
- Children with severe CPP exhibited higher peak temperatures and longer fever duration compared to those with non-severe CPP.
- Severe CPP cases showed a lower lymphocyte percentage and elevated white blood cell (WBC) count, C-reactive protein (CRP), and immunoglobulin A (IgA) levels.
- Multivariate analysis identified decreased lymphocyte percentage (OR=0.943) and elevated IgA (OR=2.227) as significant independent risk factors for severe CPP.
Conclusions:
- Reduced lymphocyte percentage and increased serum IgA levels are associated with severe CPP in children.
- These biomarkers may serve as potential indicators for risk stratification in pediatric CPP cases.
- Further multicenter prospective studies are recommended to validate these findings.
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