Enterovirus PCR (n = 186) accounted for 81% (95% CI, 76%-86%) of all nonculture CSF infection tests with a positive result, followed by Lyme Western blot (n = 12), HSV PCR (n = 10), HHV-6 PCR (n = 7), VZV PCR (n = 7), VZV IgM (n = 1), and others (Table 2). The gene discussed is CD40LG; the disease is infection.