In obedience to a long-established habit, the Wellands had left the previous week for St. Augustine, where, out of regard for the supposed susceptibility of Mr. Welland’s bronchial tubes, they always spent the latter part of the winter.
There are no more uses of "susceptibility" in the book.
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The company tests new employees for susceptibility to workplace hazards.
I don’t drink because members of my family have an increased susceptibility to alcoholism.