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To the Editor:—The following inquiries have been received pertaining to my paper, entitled, "Specific Treatment of Ophthalmic Tuberculosis with a New Tuberculosis Antigen `A O,' " in the August issue of the Archives, page 161. As ophthalmologists in general may be interested in them, I am sending the answers for publication:
Where is A O to be obtained? It can be obtained at Arimakenkiujo Ebie Nishinariku, Osaka, Japan.
When you are using a single optimal dose, do you always give it at four day intervals, and for how long a period?
For fifteen years I have been using only the optimal dose, but during the past year I have used A O, no. 1, 1 cc. for the optimal dose, for adults, every eight days.
What method have you found the best for diagnosis, the subcutaneous reaction to tuberculin or the Mantoux intradermal test? Patients are