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The unusual rarity of recorded cases of bilateral zoster makes them worth reporting; though such cases are scattered throughout the literature, they have been very infrequent when compared with the number of cases of the unilateral variety. The relative proportion will never be known, as the ordinary "shingles" is too common to be reported or recorded, in that a large percentage is seen by the general practitioner or not at all. The grandmother, as in ringworm and boils, often makes the diagnosis, and says that if the lesions do not girdle t[ill] patient he will recover; if they girdle or meet he will die. The cases of bilateral zoster reported by observers from different parts of the world are, without doubt, only a small percentage of the number that really occur, as many cases are not reported and probably are not diagnosed properly. While bilateral zoster is generally supposed by
VARNEY HR, JAMIESON RC. A BILATERAL HERPES ZOSTER. JAMA. 1910;55(5):372. doi:10.1001/jama.1910.04330050010006