A significant decrease in the mean percentage of active and total T lymphocytes was found in 20 patients with Bell's palsy during the 1st week of the disease. In 8 patients the mean percentage of T helper cells was normal, whereas the mean percentage of T suppressor cells was significantly reduced. In 4 patients a normalization of the percentage of T lymphocytes and T suppressor cells was found 3 months after disease onset. The mean percentages of cells with membrane-bound immunoglobulins, EA- and EAC-rosetting cells and phagocytes were normal. Antibodies to peripheral nerve tissue were detected in low titers in 2 out of 20 sera. In the 20 patients the mean serum concentrations of IgG, IgA, IgM, IgE, C3 and C4 were normal.
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Vedeler et al. (2008) studied this question.