Graphical Abstract (IMAGE) University College London Caption These are immune responses in the skin of young and old study participants to a saline solution and to a VZV antigen. In older participants, a p38 inhibitor improved the immune response by blocking inflammation. Credit JACI, Milica Vukmanovic-Stejic et al Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.