Demographic characteristics of individuals from seven new cohorts enrolled in the study. (A) Number of individuals from each WNV group enrolled per center. (B) Number of individuals from each WNVD group enrolled per center. (C) Age distribution of the individuals enrolled, by WNV group. (D) Age distribution of the WNVD individuals, by center. (E) Sex distribution of the individuals enrolled, by WNV group. (F) Sex distribution of the individuals enrolled, by center. WNND, WNV neuroinvasive disease, a subset of WNVD; WNE, WNV encephalitis; WNM, WNV meningitis; AFP, acute flaccid paralysis; UNS, unspecified neurological syndrome (subsets of the WNND group).