TABLE 1.

Properties of the bacterial strains used in this study

Bacterial strain	Origin	Plasmid profilea	Phage type
20	River	37.6	PT4
27	River	37.6	PT4
33	River	37.6	PT4
57	River	37.6, 3.2	PT6
942	River	37.6	PT4
45	River	37.6	PT4
4839	Cream	37.6	PT4
5161	Cake	37.6, 5.6	PNR
3934	Human	37.6	PT1
1344	Human	63, 6, 4.2	PT4
4271	Human	37.6	PT1
5507	Human	37.6, 32.5	PT6A
5996	Human	37.6	PT4
6268	Human	37.6, 32.5	PT6A

^aPlasmid size (in megadaltons).