1) PHA stimulated lymphocyte transformations are usually evaluated in cell culture of 72 hours. The same phenomenon can occur in short term cell culture, even in cell culture of 40 minutes PHA stimulation.
2) In many dermatoses, lymphocyte transformations to PHA stimulation show normal percentages of blast cell, or low excluding leprosy, all cases of which show low percentages.
3) There is a tendency that lymphocyte transformations induced by PPD as the antigen show low percentages in cases of tuberculosis cutis, and high in cases of tuberculid except lupus miliaris disseminatus faciei. The cytological forms of lymphocyte transformation in PPD and BCG stimulated cell culture show respectively macrophage like appearances and blast cell like appearances of lymphocyte to PHA. Also, cytological forms of lymphocyte transformation to the crude infiltrate obtained from culture of staphylococcus aureus are like blast cells by PHA stimulation, and those to staphylococcal vaccine (Hollister) are like macrophages.
4) Lymphocyte transformation tests to DNCB as the antigen are negative to unsensitized subjects, and are positive to sensitized ones. No lymphocyte transformations can occur in such cases as the plasma from unsensitized subjects are added to the lymphocyte obtained from sensitized same subjects.
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