Neurosyphilis

The goal of this observational study is to identify diagnostic biomarkers for neurosyphilis in patients with the condition. The main questions it aims to answer are: What plasma biomarkers are associated with neurosyphilis? What electrophysiological characteristics (EEG and eye movement) are linked to neurosyphilis? Researchers will compare biomarker data from plasma and gut microbiome analyses with electrophysiological findings to see if these factors can help diagnose neurosyphilis. Participants will: Provide clinical information such as age, gender, symptoms, and disease course Submit blood and urine samples for proteomics and metagenomic sequencing Undergo EEG and eye movement evaluations for electrophysiological analysis

The Danish Study Group of Infections of the Brain is a collaboration between all departments of infectious diseases in Denmark. The investigators aim to monitor epidemiological trends in central nervous system (CNS) infections by a prospective registration of clinical characteristics and outcome of all adult (\>17 years of age) patients with community-acquired CNS infections diagnosed and/or treated at departments of infectious diseases in Denmark since 1st of January 2015.