Viruses and bacteria in sputum samples of children with community-acquired pneumonia

Area of Science:

• Pediatrics
• Infectious Diseases
• Microbiology

Background:

• Community-acquired pneumonia (CAP) is a common childhood illness.
• Comprehensive etiological investigations, especially for co-infections, are limited in pediatric CAP.
• Identifying causative agents is crucial for effective treatment and understanding disease pathogenesis.

Purpose of the Study:

• To investigate the prevalence of viral and bacterial pathogens in hospitalized children with CAP.
• To determine the frequency of single and mixed viral-bacterial infections.
• To explore the clinical significance of identified pathogens and co-infections, including their association with treatment outcomes.

Main Methods:

• Prospective study of 76 children hospitalized with pneumonia.
• Analysis of induced sputum samples using antigen detection, PCR for 18 viruses, and culture and PCR for six bacteria.
• Clinical data collection, including treatment response and clinical characteristics.

Main Results:

• Viruses were detected in 72% of samples, bacteria in 91%, and mixed infections in 66%.
• Common viruses included rhinovirus (30%), human bocavirus (18%), and human metapneumovirus (14%).
• Prevalent bacteria were Streptococcus pneumoniae (50%), Haemophilus influenzae (38%), and Moraxella catarrhalis (28%).
• The most frequent co-infection was rhinovirus-S. pneumoniae (16%).
• All six children experiencing treatment failure had evidence of both viral and bacterial detection.

Conclusions:

• Modern molecular diagnostics reveal high rates of viral and bacterial identification in childhood CAP.
• Mixed viral-bacterial infections are frequent in pediatric CAP.
• A potential association exists between mixed infections and treatment failure, warranting further investigation into their clinical significance.