B Lymphocytes in the Thymus of Patients with Myasthenia Gravis

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To the Editor: We read with interest the paper of Abdou et al. (N Engl J Med 291:1271–1275, 1974). Using the E-rosetting technic,1 we found in three normal thymusesa mean value (±S.E.M.) of 93.4 ± 1.4 per cent of T lymphocytes, as compared to a value of 95.2 ± 1.0 per cent after neuraminidase treatment of the sheep erythrocytes.1 We also investigated the T:B ratio in three patients with myasthenia gravis, histologic study of whose thymuses showed hyperplasia with lymphoid follicles in the medulla. With the technic mentioned above, values were 56 per cent, 81 per cent and 85 per . . .