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Invasive pneumococcal infections: incidence, predisposing factors, and prognosis
Abstract:
A retrospective analysis of the case records of 494 patients with 508 episodes of pneumococcal infections verified by cultures from blood or from cerebrospinal, pleural, and/or synovial fluid from 1964 through 1980 is presented and discussed in relation to the literature on invasive pneumococcal infections. The documented incidence (1976-1980) of pneumococcal meningitis in a defined area of southwestern Sweden was similar to that reported from the United States; 1.4 cases per 100,000 persons per year; for nonmeningitic infections (mainly bacteremic pneumonia) the incidence was 6.1 per 100,000 per year. The highest age-specific incidence was seen in infants younger than two years. In the vast majority of patients, predisposing conditions (young or old age or severe underlying diseases) were present. In adults, alcoholism was the most important risk factor. The fatality rate was 33% for patients with meningitis and 15% for patients with non-meningitic infections, figures that were strikingly similar to those reported in other studies. Underlying diseases and young or old age contributed significantly to the high mortality rates.
Insights
Invasive pneumococcal infections, particularly meningitis, affected infants and adults with predisposing conditions. Alcoholism was a key risk factor in adults, with high fatality rates for both meningitis and bacteremic pneumonia.
Area of Science:
- Infectious Diseases
- Epidemiology
- Bacteriology
Background:
- Invasive pneumococcal infections pose a significant public health challenge.
- Understanding the epidemiology and risk factors of these infections is crucial for prevention and treatment.
Purpose of the Study:
- To analyze the incidence, risk factors, and outcomes of invasive pneumococcal infections.
- To compare findings with existing literature on pneumococcal disease.
Main Methods:
- Retrospective analysis of 494 patients with 508 episodes of pneumococcal infections (1964-1980).
- Infections verified by culture from blood, cerebrospinal, pleural, or synovial fluid.
- Incidence calculated for a defined area in southwestern Sweden (1976-1980).
Main Results:
- Documented incidence: 1.4 cases/100,000/year for pneumococcal meningitis and 6.1 cases/100,000/year for non-meningitic infections (bacteremic pneumonia).
- Highest incidence in infants under two years; predisposing conditions (age, severe diseases) were common.
- Alcoholism was the primary risk factor in adults.
- Fatality rates: 33% for meningitis, 15% for non-meningitic infections.
Conclusions:
- Invasive pneumococcal infections disproportionately affect the very young and old, and those with underlying health issues.
- Alcoholism is a significant risk factor for invasive pneumococcal disease in adults.
- High mortality rates underscore the severity of these infections and the need for effective interventions.