Mountain Valley MD Holdings Inc. announced the appointment of John D. Clements to its Advisory Board. John Clements is Emeritus Professor of Microbiology and Immunology at Tulane University School of Medicine. Clements has served on numerous scientific panels and Editorial Boards and was an Editor for Infection and Immunity from 1999 - 2005. He currently serves on the Scientific Advisory Board of the PATH Enteric Vaccine initiative.