TABLE 1.

Biofilm production in the microtiter plate assay at 12, 20, and 37°C

Serotype	No. of isolates tested	Mean OD595a ± SD (range) at temp (°C) of:
		12	20	37
O103:H2	42	1.35 ± 0.60 (0.05–2.51) a	1.38 ± 0.45 (0.07–2.01) a	0.58 ± 0.64 (0.04–2.15) b
O103:H25	32	0.03 ± 0.01 (0.00–0.06) c	0.04 ± 0.03 (0.00–0.10) cd	0.04 ± 0.01 (0.02–0.08) c
O26:H11	25	0.06 ± 0.12 (0.00–0.49) c	0.09 ± 0.11 (0.00–0.43) de	0.15 ± 0.18 (0.02–0.66) e
O103:H2 eae positive	19	1.34 ± 0.52 (0.05–2.18) a	1.38 ± 0.51 (0.07–1.99) a	0.12 ± 0.09 (0.04–0.34) f
O103:H2 eae negative	23	1.37 ± 0.68 (0.16–2.51) a	1.37 ± 0.41 (0.72–2.01) a	0.95 ± 0.65 (0.04–2.15) g

^aDifferent letters signify that the means are statistically different at a P value of <0.05.