A newly defined threshold for the concentration of the cytokine CXCL13 may improve the diagnosis of neuroborreliosis. The clinical diagnosis of this disease, which is caused by infections from tick bites, is still difficult and often occurs long after infection. CXCL13 now makes it possible to diagnose neuroborreliosis more quickly and start treatment earlier. In the study conducted by the Karl Landsteiner University of Health Sciences (KL Krems), a concentration of CXCL13 in the cerebrospinal fluid of > 271 pg/ml was identified with a very high statistical certainty as the threshold value for a better diagnosis of neuroborreliosis.