Table 2.

Average differences in log bacterial measures (shedding and in vivo bioluminescence) per passage in a chain and between conditions (with or without nalidixic acid supplementation)

		Bacterial shedding		In vivo bioluminescence (photons s−1)
		CFU g−1 stool	RLU g−1 stool	Abdomen	Rectum
Step in chain	Log ratio	−0.093	−0.016	−0.024	−0.001
	Standard deviation	0.014	0.010	0.008	0.007
Treatment	Log ratio	−0.379	−0.379	−0.137	−0.264
	Standard deviation	0.317	0.256	0.179	0.173