Table 1. Characteristics of the study cohorts.
Total	Female (%)	Median Age (years)	Immunosuppressed (%)	With Transplant (%)	With Immuno Medication (%)	MGH (%) vs BWH	Positive CSF IgM (%)	Positive CSF PCR (%)	Positive Serum IgM (%)	Positive Serum PCR (%)	Cohort
789.0	44.9	62.0	14.8	12.3	3.2	49.3	2.9	0.1	13.6	0.0	Total
672.0	45.8	61.5	0.0	0.0	0.0	54.5	3.2	0.2	15.8	0.0	Immunocompetent
117.0	39.3	67.0	100.0	82.9	21.4	19.7	0.0	0.0	0.0	0.0	Immunosuppressed