TABLE 2.

Sequential isolates from 59 MRSA carriers sampled at time intervals of 31 to 800 days

Patient no.PFGEVNTR analysis
Isolate 1 strain no.Isolate 1 SmaI patternIsolate 2 strain no.Isolate 2 SmaI patternNo. of bands different between isolates 1 and 2Interval between samplings (days)Distance (%)aCluster type(s) for isolates 1 and 2b
13A4A07670.9187A-A
25A6A04321.2847A-A
37A8A03301.9567A-A
413A14A0449.1058cA2-A3
521A22A01010.637A-A
649A50A03473.5113A-A
781A82A0630.5367A-A
883A84A0822.8817A-A
985A86A05391.1944A-A
1089A90A01340.6931A-A
1193A94A0680.3602A-A
1295A96A05428.2947cA1-A6
1397A98Aj62141.7809A-A
1499A100A0960.9844A-A
15101A102A01080.9919A-A
16111A112An21242.1468A-A
17115A116A01690.5399A-A
18117A118A03117.0523cA1-A5
19121A122A0430.5024A-A
20125A126A01041.2395A-A
21133A134A05542.5202cB-A
22135Ac136Ac0500.4995A1-A1
239C10C02850.5801B-B
2415C16C0834.4952B-B
2517C18Cb21843.5772B-B
2619C20C0330.5868B-B
2739C40C0420.2429B-B
2867C68C0770.4621B-B
29139C140C0420.6546B-B
30234h244h0410.3421C-C
31254h264h01182.7194C-C
32274h284h01071.2657C-C
33294h304h0380.9165C-C
34334h344h01000.5886C-C
35354h364h010014.9817cC-C1
36611062100940.9419B1-B1
37631064100411.0679B1-B1
38751076100770.3062B-B
397710781001850.165B1-B1
40911092100340.4918B-B
41105101061003710.4987B1-B1
427310e7410e0830.6818B-B
4313111132110470.2004B1-B1
4411313114130700.2517B-B
45137131381302290.3546B-B
4687188818a18001.2829B-B
47791980190370.2235C1-C1
48127331283302220.4565C-C
4912337124370340.3595C1-C1
5010717e10817e01146.1733B-B
517117f7217g4801.1087C1-C1
524555a4655a0601.8613C-C
531295a1305a0550.5868D-D
541095f110522870.4625D-D
55697a707a01538.5125*B-B1
56657g667g0572.0724B-B
5731Da32Da0451.5353C-C
5810351045b25170.6063D-D
591198120801986.2747B-B
  • a Distance calculated between the pair of strains considered.

  • b Clusters were denominated A (the larger one) to D, and subclusters were defined by using the 7.5% cutoff value (see Results). Strains showing distances ranging from 0 to 7.5% were considered to belong to the same cluster. An additional 7.5% distance value defined subclusters (indicated by numbers) containing related but not clonal strains.

  • c Pairs of strains showing a significant distance difference.