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Brucellosis is a highly contagious zoonotic disease caused by bacteria that belong to the genus  Brucella . It is a major endemic disease in northern China. We reported a rare case of central nervous system (CNS) infection caused by  Brucella melitensis  in a patient living in non-endemic areas. The medical history of the patient included chronic headache and trunk numbness. Based on the presented clinical symptoms and medical examinations, a clinical diagnosis of binocular uveo-encephalitis was made in the local hospital. The patient's symptoms were unrelieved after being treated with empiric therapy. Soon after, the patient was admitted to our hospital because of the obnubilation and coma in the trip. We ran a few examinations and sent the cerebrospinal fluid (CSF) for metagenomic next-generation sequencing (mNGS) immediately. The Magnetic resonance imaging (MRI) examination was unremarkable, and bilateral mastoid inflammation was attached. Metagenomic next-generation sequencing suggested a CNS infection caused by  Brucella melitensis . Then, the results of the serum agglutination test and quantitative polymerase chain reaction assay also confirmed that. After being treated with doxycycline, rifampin, and cefatriaxone, consciousness of the patient was restored and headache diminished. Two months later, a lumbar puncture was used to check the pressure of the CSF, and the total course of treatment was more than 6 months. This case highlighted the potential value of mNGS in early clinal diagnosis. We believe that mNGS may be a complementary method for rapid identification of infection of CNS caused by the pathogen.

Case Report: Metagenomic Next-Generation Sequencing Confirmed a Case of Central Nervous System Infection With Brucella melitensis in Non-endemic Areas