“…The risk of getting HZ significantly increases with age, from an average of 3 cases per 1000 adults 40-50 years old, to 10 cases of HZ per 1000 adults aged ≥80 years (Keating, 2013). In addition, the incidence of HZ in individuals receiving immunosuppressive drugs such as those with autoimmune diseases, cancer, and organ transplant recipients is higher (Arvin, 2000; Rusthoven et al , 1988; Wilson et al , 1972; Yawn et al , 2011). VZV has also been shown to reactivate following stressful situations (Schmader et al , 1990), such as during and after spaceflight (Randall J. Cohrs, 2008) and in medical students (Uchakin et al , 2011).…”