Problem pathogens: paediatric legionellosis--implications for improved diagnosis

Area of Science:

• Pediatric Infectious Diseases
• Respiratory Medicine
• Microbiology

Background:

• Legionnaires' disease is a known cause of adult pneumonia but considered rare in children.
• Prompt diagnosis and appropriate treatment are crucial for managing severe pediatric respiratory infections.

Purpose of the Study:

• To review and analyze the epidemiology, clinical features, and treatment outcomes of Legionnaires' disease in children.
• To assess the mortality rates and identify risk factors associated with Legionnaires' disease in pediatric patients.
• To emphasize the importance of considering Legionnaires' disease in pediatric pneumonia, especially in unresponsive cases.

Main Methods:

• Systematic review of medical literature for reported cases of Legionnaires' disease in children.
• Analysis of epidemiological data, including age, acquisition source, and underlying conditions.
• Evaluation of clinical presentation, diagnostic methods, treatment strategies, and patient outcomes, including mortality.

Main Results:

• 76 pediatric cases of Legionnaires' disease were identified, with 56% diagnosed via culture.
• Community-acquired infections accounted for 46%, and 51.5% of patients were under 2 years old.
• A high mortality rate of 33% was observed, particularly in infants and immunocompromised children; however, appropriate anti-legionella therapy reduced mortality from 70% to 23%.

Conclusions:

• Legionnaires' disease can present severely in children, with no unique clinical features to distinguish it from other pneumonias.
• Awareness is critical, as empirical antibiotic therapies for pediatric pneumonia are often ineffective against Legionella.
• Prompt consideration of Legionnaires' disease and specific diagnostic testing are vital for improving outcomes in severe pediatric pneumonia unresponsive to standard treatment.