Table 1. Temporal variation in the distribution of selected mobile genetic elements among USA300 isolates. Based on isolates derived from healthcare centres selected for temporal analysis (HC1, HC6, HC7, HC10) .
| 2004 | 2009 | 2010 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N* | SCCmec | ACME | ΦSa5 | N* | SCCmec | ACME | ΦSa5 | N* | SCCmec | ACME | ΦSa5 | |
| HC1 | 14 | 14 | 14 | 2 | na | na | na | na | 8 | 6 | 7 | 5 |
| HC6 | 6 | 6 | 6 | 1 | 12 | 12 | 12 | 4 | 8 | 7 | 7 | 3 |
| HC7 | 8 | 8 | 8 | 3 | 10 | 9 | 8 | 2 | 5 | 2 | 4 | 3 |
| HC10 | 18 | 18 | 18 | 2 | 1 | 1 | 1 | 0 | 8 | 6 | 6 | 3 |
| Total | 46 | 46 | 46 | 8 | 23 | 22 | 21 | 6 | 29 | 21 | 24 | 14 |
| p† | 0.19 | <0.05 | 0.7 | |||||||||
| p‡ | <0.05 | <0.05 | <0.05 | |||||||||
| p§ | <0.05 | 0.39 | 0.07 | |||||||||
*
Total number of USA300 isolates identified for corresponding centre and year.
†
p value after controlling for each HC, for the distribution of corresponding MGE among USA300 isolates in 2004 and 2009.
‡
p value after controlling for each HC, for the distribution of corresponding MGE among USA300 isolates in 2004 and 2010.
§
p value after controlling for each HC, for the distribution of corresponding MGE among USA300 isolates in 2009 and 2010.