Sum of urinary nitrate and nitrite (NOx) excretion in the non-infected (○), infected (■) groups of the time course infection study (A). And the urinary NOx excretion in the cellulose infected (■) and in the fructo-oligosaccharide (FOS) infected (▲) groups in the dietary infection study (B). Infected rats were orally challenged with S. enteritidis on day 0. Results are expressed as mean ± SEM (n = 8 in the time course infection study and n = 6 in the dietary infection study). * p < 0.05.