Case Report: Cervical lymphadenitis resulting from <i>Pseudomonas aeruginosa</i> diagnosed by metagenomic next-generation sequencing.

Pediatric cervical lymphadenitis is usually caused by Staphylococcus aureus and Streptococcus pyogenes. Cases resulting from Gram-negative bacteria are rare. Herein, we report the case of an 11-year-old boy who developed cervical lymphadenitis. He was diagnosed with a Pseudomonas aeruginosa infection through metagenomics next-generation sequencing of blood and biopsy. After treatment with meropenem, the patient's condition improved and he was discharged. Lymphadenitis may be caused by Gram-negative opportunistic pathogens. Metagenomic next-generation sequencing can help identify the underlying cause.