Anumber of studies have investigated the effects of stress on mental health and cardiovascular diseases and the relationship between stress and various components of the immune system,and they found that chronic stress is associated with suppression of a variety of immune parameters.However,acute stress is often associated with transient increases in immune activation.1 A few studies have also examined the slgA response to occupational stress.Zeier et al2 measured salivary sIgA in air traffic controllers before and immediately after radar working sessions lasting approximately 100 minutes.