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Updated: Jun 13, 2025
Use of Galleria mellonella as a Model Organism to Study Legionella pneumophila Infection
Published on: November 22, 2013
[Two cases of neonatal Legionella pneumonia]
Yin-Zhi Liu1, Rong Zhang1, Jing-Jing Xie1
1Department of Neonatology, Children's Hospital of Xiangya School of Medicine, Central South University (Hunan Children's Hospital), Changsha 410007, China.
Insights
Metagenomic next-generation sequencing (mNGS) aids in diagnosing severe neonatal pneumonia caused by Legionella pneumophila (LP). Early diagnosis and treatment with macrolide antibiotics like azithromycin are crucial for infant recovery.
Area of Science:
- Neonatology
- Infectious Diseases
- Genomics
Background:
- Neonatal pneumonia presents with non-specific symptoms, complicating early diagnosis.
- Legionella pneumophila (LP) is a potential cause of severe neonatal infections.
- Metagenomic next-generation sequencing (mNGS) offers a broad diagnostic approach for unknown infections.
Purpose of the Study:
- To highlight the utility of mNGS in diagnosing neonatal Legionella pneumophila infections.
- To emphasize the clinical presentation and management of neonatal LP pneumonia and sepsis.
- To advocate for azithromycin as a preferred treatment for neonatal LP pneumonia.
Main Methods:
- Case reports of two neonates with severe pneumonia and sepsis.
- Utilized metagenomic next-generation sequencing (mNGS) on blood, bronchoalveolar lavage fluid, and cerebrospinal fluid.
- Clinical data collection on presentation, diagnosis, treatment, and outcomes.
Main Results:
- mNGS identified Legionella pneumophila in both patients, enabling definitive diagnosis of LP pneumonia, sepsis, and intracranial infection in one case.
- Both infants received macrolide antibiotic therapy (erythromycin and azithromycin) and recovered.
- Patient 1 received erythromycin and azithromycin; Patient 2 received erythromycin.
Conclusions:
- Neonatal LP pneumonia requires high clinical suspicion due to non-specific symptoms.
- mNGS is a valuable tool for rapid and accurate diagnosis of severe neonatal pneumonia of unknown etiology.
- Azithromycin is recommended as a preferred antimicrobial agent for neonatal LP pneumonia.
Abstract:
Patient 1, a 12-day-old female infant, presented with fever, cough, dyspnea, and elevated infection markers, requiring respiratory support. Metagenomic next-generation sequencing (mNGS) of blood and bronchoalveolar lavage fluid revealed Legionella pneumophila (LP), leading to diagnoses of LP pneumonia and LP sepsis. The patient was treated with erythromycin for 15 days and azithromycin for 5 days, resulting in recovery and discharge. Patient 2, an 11-day-old female infant, presented with dyspnea, fever, elevated infection markers, and multiple organ dysfunction, requiring mechanical ventilation. mNGS of blood and cerebrospinal fluid indicated LP, leading to diagnoses of LP pneumonia, LP sepsis, and LP intracranial infection. The patient was treated with erythromycin for 19 days and was discharged after recovery. Neonatal LP pneumonia lacks specific clinical symptoms, and azithromycin is the preferred antimicrobial agent. The use of mNGS can provide early and definitive diagnosis for severe neonatal pneumonia of unknown origin.
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