2.2 Body weight and faecal bacterial output measurement
Body weight changes of the mice in each group were monitored every day from the first day of C. rodentium infection. The number ofC. rodentium in each gram of faeces (CFU/g) was calculated and continuously recorded for 7 d. At the same time, the faeces of mice in the infected groups were collected and cultured on selective MacConkey agar (M8560, Solarbio). Bacterial colonies were then counted after culturing at 37 °C.