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In the past 40 years, a growing body of literature has shown that chronic psychological stress can lead to immune dysregulation. Notably, these stress-induced immune changes are large enough to be clinically relevant. Chronic stress has been associated with a state of chronic low-grade inflammation, delayed wound healing, poor responses to vaccine, and increased susceptibility to infectious illnesses. Activation of neuroendocrine and sympathetic systems provides physiological pathways linking stress and these immune outcomes. Behavioral changes under conditions of chronic stress also contribute to immune dysregulation. Behavioral and pharmacological interventions may attenuate stress-induced immune dysregulation.