Laurie A Housel1, Bruce M McClenathan2. 1. Defense Health Agency, Immunization-Healthcare Division, Fort Bragg, NC; Department of Medicine, Womack Army Medical Center, Fort Bragg, NC. Electronic address: Laurie.a.housel.civ@mail.mil. 2. Defense Health Agency, Immunization-Healthcare Division, Fort Bragg, NC; Department of Medicine, Womack Army Medical Center, Fort Bragg, NC.