Rare if ever: If you had true cpx after a year of age you likely have lifelong immunity.People with immune defects or after a bone marrow transplant may be susceptable.Some have questioned whether kids having it under 6mo may be only partially protected, but there are few available to confirm this.You can have a blood test to see if you have antibody protection.Some blistering conditions mimic cpx and are wrong.
Answered 3/7/2014
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