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To the Editor:
—In a recent leading article in The Journal, reference is made to some views that I am supposed to hold, and which, it is said, are no longer seriously considered. I am sure you will allow me space to say that the belief that poliomyelitis and encephalitis lethargica have the same virus, or that the virus of encephalitis lethargica is the same, or a variation of that of poliomyelitis, does not quite accurately represent my position.So far as I can see, there has not yet been put forward any single clinical, epidemiologic or pathologic criterion that clearly separates the vast mass of these nervous cases into two groups: that enables us to say definitely, in respect of all cases, which should be put on the left and which on the right. So long as this is so, it seems to me wise to use one common
Crookshank PG. EPIDEMIC ENCEPHALITIS. JAMA. 1923;80(20):1473–1474. doi:10.1001/jama.1923.02640470051029
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