Fig. 1From: Evidence of rickettsiae in Danish patients tested for Lyme neuroborreliosis: a retrospective study of archival samplesStudy flow-chart. CSF; cerebrospinal fluid; PCR; polymerase chain reaction; IFA; indirect immunofluorescense assay. * = Six of the AI negative sera samples contained insufficient volume for PCR analysis and were therefore not analyzed using this methodBack to article page