TABLE 3.

Comparison of phage tail inductions of Listeria spp. in BHIK and BHIM

Listeria strain	Highest dilution factor of culture filtrate corresponding to the threshold of phage tail lysis activitya
	BHIK	BHIM
L. monocytogenes NV3	1 A	ND
L. monocytogenes 8F	1 A	ND
L. monocytogenes 4F	8 B	ND
L. monocytogenes 7F	8 B	ND
L. monocytogenes H4	32 C	ND
L. monocytogenes 1S	8 B	1 A
L. monocytogenes P8	8 B	2 A
L. monocytogenes Pi17	16 BC	2 A
L. innocua Pi3	32 C	2 A
L. innocua Pi53	32 C	8 B
L. monocytogenes EGD-e	64 CD	2 A
L. innocua Pi2	128 D	8 B

^aThe Listeria strains were grown in BHIK or BHIM broth as two successive cultures (24 h at 30°C). Two-fold serial dilutions of the Listeria culture filtrates were applied on L. ivanovii RR3 lawns. The level of phage tail induction is expressed as the highest dilution factor of filtrate that induced a detectable RR3 lysis zone. The results are representative of three experiments. Values followed by different letters are significantly different. ND, not detected.