Depends on variables: Most will only have it once. Some have other blister producing illnesses like hand/food/mouth disease and are mislabeled cpx, only to have real cpx later. A handful of people with immune deficiencies and those that have had a bone marrow transplant may have it again (should get the vaccine). For 99.9% of the population, 1 is the magic number.
Answered 12/10/2013
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