 Subjects with Guillain Barré with potential exposure to Zika virus are of special interest given the severity of disease. Subjects with Guillian Barré do not need to have a preceding illness suggestive of Zika or other viruses. As there are few subjects with Guillain Barré, subjects will be enrolled in two ways - a prospective cohort for subjects with acute Guillain Barré, and a cohort for subjects that had Guillain Barré in the last several years. Data collected systematically from these cohorts will improve the understanding of ZikaChikungunyaDengue virus infections. 