IMMUNITY IN MUMPS : V. THE CORRELATION OF THE PRESENCE OF DERMAL HYPERSENSITIVITY AND RESISTANCE TO MUMPS.

It is probable that this degreeof correlation approaches the maximum Whichcan be obtained since the tests wereper- formed with material of apparently high potency in those whose histories were possibly as reliable as can ordinarily be securedin a group of a sizesufficientfor adequate statistical treat- ment. From Table IX it can be seen that the mean incidence of positive skin tests was substantially lower among those who denied a previous attack, although in two of the individual groups the differences are scarcely significant.

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