Beneficial effects against infections (e.g., the influenza virus), including increased helper T cells in the lung parenchyma.Reduce the recruitment of granulocytes and the expression of the proinflammatory cytokines that inhibit the development of pneumonia virus.Increase interferon-γ and interleukin-2. Prevents virus replication.Increase the proportions of total, helper (CD4+), and activated (CD25+) T cells and NK cells in the blood.Activate plasmacytoid dendritic cells.Reduce the tissue damage caused by inflammation in TGEV (gastroenteritis coronavirus). This evidence concerns the gene CD4 and susceptibility to pneumonia measurement.