Eileen notices that her herpes infection is especially likely to flare up during the stressful occasions when she needs to work overtime hours in order to meet pressing deadlines. this is most likely to be caused by her body's

This is most likely to be caused by her body's reduced levels of lymphocytes. Stress would lead to high level of cortisol in the body which would result to a decrease in lymphocytes that is produced by the glands and the nodes. Consequently, would lower down the immune system of Eileen.