Based on a meta-analysis of almost 300 studies and about 20,000 participants by segerstrom & miller (2004), who is most likely to suffer the greatest suppression of his or her immune system

Most of the sick and elderly people usually suffer from the greatest suppression of the immune system. They are prone on this because usually old person do not have enough sleep then it cause to down their immune system. Same as with sick person, they do not have the enough nutrients at vitamins. They become more stressful because of thinking too much about their health conditions thus they will also suffer from this.