CD4 and gastroenteritis: Intestinal inflammation in piglets was induced by intraperitoneal injection of LPS for 4 h, including an increase in leukocytes and the percentage of monocytes, eosinophils, basophils and CD8+ T cells in the whole blood and a decrease in the ratio of CD4+/CD8+ T cells (p < 0.05; Figures 2A,D–F,H,I).