2 Nissan 5712
Peace and blessing!
[This is] in response to your letter from 23 Adar, in which you wrote to me that you had read in the newspaper that a new medicine for paralysis has been developed in the United States, discovered by a certain doctor in St. Louis, and you asked my opinion about this.
According to what I was able to find out, this is not a tested or proven medicine. And in fact, it's not [really] a medicine, but only eases the symptoms. There is also room for concern since these are potent injections which carry possible risk of injury, etc.
Based on this, it is my opinion that it is not worthwhile to rely on the information we're hearing and take measures which entail the aforementioned concerns.
G-d will send healing through another medium, and you'll soon be able to send me good tidings about this.
With blessings for the Passover holiday to be kosher and truly happy, both for you and for your whole family, especially your grandson and parents, may they all live [and be well].
M Schneerson (Source)