Suppression of humoral immune response due to psychological stress in survivors of large scale natural disaster

ABSTRACT

To study the impact of psychological stress following a natural disaster on specific immunological parameters. The study was carried out over a 3 month period [Feb 2006 to May 2006] at the Armed Forces Institute of Pathology, Rawalpindi, Pakistan. Physically uninjured male adults between 15-60 years of age, with no prior history of an active physical or psychological disorder, who witnessed the earthquake on 8[th] Oct, 2005 in Pakistan but escaped physical injury, were included in the study. Age and gender matched healthy adults were also studied as control group. Analysis of haemoglobin, total leucocyte count, lymphocyte count, lymphocyte subsets, IgG, IgA, IgM levels, C reactive protein and nitrobluetetrazolium [NBT] dye reduction test was carried out on both the groups. Psychologically distressed individuals had increased CD 3+ cells [p=0.02], increased CD4CD8 ration [p=0.04], reduced CD19+ cells count [p=0.03] and IgG levels [p=0.01]. Neutrophil oxidative burst activity without stimulation was increased [p=0.02]. Psychological stress consequent to exposure to a natural disaster can suppress humoral immune response