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 (%)	Total_Test_CSF_IgM	Total_Test_CSF_PCR	Total_Test_Serum_IgM	Total_Test_Serum_PCR	Total_Positive_CSF_IgM	Total_Positive_CSF_PCR	Total_Positive_Serum_IgM	Total_Positive_Serum_PCR	Percent_Test_CSF_IgM	Percent_Test_CSF_PCR	Cohort
789.0	44.9	62.0	14.8	12.3	3.2	49.3	2.9	0.1	13.6	0.0	206.0	673.0	22.0	3,200.0	6.0	1.0	3.0	0.0	26.1	85.3	Total
672.0	45.8	61.5	0.0	0.0	0.0	54.5	3.2	0.2	15.8	0.0	185.0	568.0	19.0	2,600.0	6.0	1.0	3.0	0.0	27.5	84.5	Immunocompetent
117.0	39.3	67.0	100.0	82.9	21.4	19.7	0.0	0.0	0.0	0.0	21.0	105.0	3.0	600.0	0.0	0.0	0.0	0.0	17.9	89.7	Immunosuppressed