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Etiology and severity of community acquired pneumonia in children from Uruguay: a 4-year study
Insights
This study investigated childhood pneumonia, finding viruses common in infants and bacteria in older children. Pathogen identification varied annually, impacting disease severity and highlighting key risk factors.
Area of Science:
- Pediatric infectious diseases
- Clinical epidemiology
Background:
- Pneumonia remains a leading cause of childhood illness globally.
- Understanding etiological agents and risk factors is crucial for effective management.
Purpose of the Study:
- To characterize clinical and epidemiological features of childhood pneumonia.
- To identify causative pathogens and factors associated with severe cases.
- To explore variations in pathogen prevalence and their impact on disease severity.
Main Methods:
- A 4-year prospective study (1987-1990) of 541 children diagnosed with pneumonia.
- Etiological diagnosis through pathogen identification.
- Comparison of clinical data and risk factors between pneumonia cases and healthy controls.
Main Results:
- Etiology was identified in 47.7% of cases, with viruses (38.6%) and bacteria (12.6%) as primary agents.
- Respiratory syncytial virus was the predominant virus; Streptococcus pneumoniae and Haemophilus influenzae were key bacteria.
- Viral/mixed infections were more common in infants <12 months; bacteria predominated in 6-23 month olds.
- Annual variations in pathogen prevalence, particularly H. influenzae and mixed infections, were observed.
- Severe pneumonia correlated with higher respiratory rates, pleural effusion, or extensive lung compromise.
- Significant individual and family risk factors for pneumonia were identified.
Conclusions:
- Childhood pneumonia etiology varies by age and season, influencing disease severity.
- Prompt etiological diagnosis and identification of risk factors are vital for clinical management.
- Further research into pathogen dynamics and preventative strategies is warranted.
Abstract:
The 4-year study (1987-1990) covered the major clinical-epidemiological characteristics of pneumonia in children as diagnosed at the emergency service of the Children's Hospital, as well as etiologies, and factors involved in the most severe cases. Etiology was determined in 47.7% of the 541 pneumonia cases, involving 283 pathogens of which 38.6% were viruses and 12.6% bacteria. Viral and mixed etiologies were more frequent in children under 12 months of age. Bacteria predominated in ages between 6 and 23 months. Among the viruses, respiratory syncytial virus predominated (66%). The bacterial pneumonias accounted for 12.2% of the recognized etiologies. The most important bacterial agents were S. pneumoniae (64%) and H. influenzae (19%). H. influenzae and mixed infections had a relevant participation during the 1988 season, pointing to annual variations in the relative participation of pathogens and its possible implication in severity of diseases. Correlation of severity and increased percentage of etiological diagnosis was assessed: patients with respiratory rates over 70 rpm, or pleural effusion and/or extensive pulmonary parenchyma compromise yielded higher positive laboratory results. Various individual and family risk factors were recognized when comparing pneumonia children with healthy controls.