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A cohort of 104 miners working for a long time in one uranium mine was examined on the blood serum immunoglobulins IgG, IgA, and IgM content. A significant circum-annual oscillations of the values of all three Ig were shown. The peaks of the IgG values were reached in summer, those of IgA in winter, and those of IgM in spring. The largest drops of the IgG values were reached in spring, those of IgA in summer, and those of IgM in autumn. The frequency distribution analysis suggested the possibility that a subpopulation separating itself from its remainder takes part in the seasonal swing towards the low level limits of the Ig.