IL17A and Stroke: Reduced species diversity and bacterial overgrowth of bacteroidetes were associated with intestinal barrier dysfunction and reduced intestinal motility; gut dysbiosis intensifies the ingress of Th17- and IL17-secreting γ δ T-cells (γ δ T-cells) into the CNS from the intestine, leading to chronic systemic and neuroinflammation. Higher numbers of proinflammatory lymphocyte populations correlate negatively with stroke outcome, which is reflected as larger infarct size, brain edema, and neurological deficits; FMT improves stroke outcome.