Table 3. Artificial infection results of the strain QT520.

Group	Concentration of QT520 (CFU/mL)	Number	Accumulative death number							Total deaths	Mortality (%)
			1d	2d	3d	4d	5d	6d	7d
1	1.47×108	10	9	1	0	0	0	0	0	10	100
2	1.47×107	10	6	2	0	0	0	0	0	8	80
3	1.47×106	10	0	4	0	0	0	0	0	4	40
4	1.47×105	10	0	0	0	0	0	0	0	0	0
Control group	0.8%NaCl	10	0	0	0	0	0	0	0	0	0