1   R AGTAGTTTTCCCTTTGCTCTCA     cj0589 F ATGGGGCTTTATTAGTTATT 547 46.6   R TCGCTTGATCTTACACCT     cj0628 F ATCAAAACAATTCGGCAACTT 455 51.5   R ACTTCGATTCAATATACCAACACC     cj0780 F TGGCGTTAAAGCGGGTGATA 492 52.8   R CCTGGTTTTGGGTTGATAGTCTT     cj1158 F TTTAAACATATCATAAGCACCTTTTT 107 46.0   R GCTATTACTTCTCCCGTGATTTAT    

cj1202 F ATCAAAAATCTTCATGCTATCTTA 434 48.8   R TTATCTGTTCCTGCATTTACCTTA     cj1218 F AATTCTTTCGACTTCTTCC 317 46.6   R ATTTTATCGGCACACTTGA find more     cj1318/ cj1336 F GGAGGAAATGGAAAAGTTGAA 477 48.2   R AAATTGAGTACGCAGAGGTTGT     cj1333 F TTTTGGGGAATTTGATAAGGA 460 44.6   R ACAGTTGTAGGTGGTAATA     cj1463 F AAAGCCTTAAAAGAACAAACCAA 174 48.8   R TGAAAAACCCATACCTCCACTTA     cj1622 F ACGCCTTACATGAGTTTAT 438 48.4   R TAGGGCAATCTTTTCTTATG     cj1729 F CCATCTGCCGTTACTACTACTTTT 441 52.2   R ACAGGCTGGAACACCGACTATTA     The “cj” locus designations refer to genes present in NCTC 11168, while the “cje” locus designation refers to a gene in RM1221. All four isolates appeared fully motile when grown in semi-solid agar at 37°C under microaerobic conditions. The mean diameter of swarming growth in mm was as follows: 00–2426 (n = 12), 30.3 ± 7.4; 00–2425 (n = 12) 31.0 ± 4.7; 00–2538

(n = 9), 33.4 ± 5.2; 00-2544 (n = 11), 32.5 ± 3.7. Analysis using the One Ro 61-8048 nmr Way ANOVA indicated that there was no significant statistical difference between strains (Normality test passed, P = 0.470; Equal Variance test passed, P = 0.192, Power of Performed test with alpha = 0.50 was 0.049, below the desired power of 0.800), though the low value for the latter measure indicates results should be interpreted cautiously. Growth curves were done to determine whether the presence or absence of the CJIE1-family prophage affected growth of Exoribonuclease the organism. Each growth curve experiment compared one of the isolates carrying the CJIE1 prophage homolog with isolate 00–2426, which lacked the prophage (Figure 1). The growth curves shown are representative of the results from a number of growth curve experiments. There were subtle differences in growth in mid-log phase, with 00–2425, 00–2544, and 00–2538 all growing slightly

faster (steeper slope of the line) than 00–2426. Though extremely subtle, this appeared to be consistent between experiments. Doubling times in mid-log phase were between 1.5 h and 2 h depending on the experiment. Figure 1 Growth curves for C. jejuni isolates. A. isolate 00-2425, with prophage vs. 00-2426, without prophage; B. isolate 00-2538, with prophage vs. 00-2426, without prophage; C. isolate 00-2544, with prophage vs. 00-2426, without prophage. Each set of paired growth curves was done during the same week from independent cultures as summarized in the Materials and Methods Adherence and invasion studies Isolates carrying the CJEI1 prophage homologs showed a moderate, but reproducible, difference in adherence and invasion (Figure 2A, Table 2). Control strain C. jejuni 81–176 was, on average, about 3-fold more adherent than the other C.