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Unraveling the Risks: Epidemiology of Complicated Pneumococcal Bloodstream Infections
Nongnooch Poowanawittayakom1, Rashini Jayawarden2, Robin Chamberland3
1Infectious Disease, Washington University School of Medicine, St. Louis, USA.
Cureus
|December 26, 2025
Summary
Older age and pre-existing heart disease increase the risk of complicated pneumococcal bacteremia. Understanding these risk factors is crucial for preventing severe invasive pneumococcal disease.
Area of Science:
- Infectious Diseases
- Cardiology
- Public Health
Background:
- Invasive pneumococcal infections, including bacteremia, contribute significantly to illness and death, especially in those with chronic health issues.
- Identifying factors that lead to severe pneumococcal infections is essential for effective prevention and treatment strategies.
Purpose of the Study:
- To determine the link between patient comorbidities, specifically chronic cardiac disease, and the development of complicated pneumococcal bacteremia.
- To evaluate vaccine coverage and clinical outcomes in high-risk individuals with invasive pneumococcal infections.
Main Methods:
- A retrospective review of medical records for patients with invasive Streptococcus pneumoniae infection between 2018 and 2024.
- Data included demographics, comorbidities, vaccination status, and clinical presentation; complicated bacteremia involved organ involvement.
- Multivariable regression analysis was used to identify significant predictors (P <0.05).
Main Results:
- Older age, pre-existing heart disease, and congestive heart failure were significantly associated with complicated bacteremia.
- Common complications included endocarditis, septic emboli, empyema, and pneumonia; many patients required intensive care unit admission.
- Low vaccination rates were observed among patients with complicated pneumococcal bacteremia.
Conclusions:
- Older age and pre-existing cardiac conditions are major predictors of complicated pneumococcal bacteremia.
- Despite advancements, invasive pneumococcal disease remains a significant cause of morbidity and mortality.
- Understanding risk factors is vital for improving prevention, early detection, and patient outcomes in invasive pneumococcal infections.
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