Table 1.
Characteristics of 9 Army Infantry Training Classes Included in Genomic Analysis of USA300 Methicillin-Resistant Staphylococcus aureus from Clusters of Skin and Soft Tissue Infection
| Class | Training Period, Start– Finish (month/year) | Total Number of Traineesa | Number (%) of SSTI Casesb | Number (%) of Purulent SSTI Casesc | USA300 Methicillin-Resistant Staphylococcus aureus SSTI | ||
|---|---|---|---|---|---|---|---|
| Number (%) of Casesd | Median (range) Number of Days from Training Start to Presentation | Number of Days Between First and Last Case in Class | |||||
| A | 2/13–5/13 | 222 | 28 (13) | 16 (57) | 13 (81) | 36.5 (13–75) | 62 |
| B | 7/14–10/14 | 230 | 31 (13) | 21 (68) | 11 (52) | 60 (20–90) | 70 |
| C | 11/12–2/13 | 227 | 19 (8) | 14 (74) | 11 (79) | 42.5 (28–93) | 65 |
| D | 4/14–7/14 | 218 | 21 (10) | 14 (67) | 9 (64) | 76.5 (17–87) | 70 |
| E | 11/12–3/13 | 208 | 18 (9) | 11 (61) | 8 (72) | 19.5 (10–88) | 78 |
| F | 5/12–8/12 | 231 | 11 (5) | 8 (73) | 8 (100) | 64 (10–91) | 81 |
| G | 6/13–9/13 | 237 | 22 (9) | 14 (64) | 7 (50) | 66 (45–75) | 30 |
| H | 6/13–8/13 | 215 | 28 (13) | 15 (54) | 7 (47) | 41 (10–54) | 44 |
| I | 3/13–6/13 | 229 | 8 (3) | 6 (75) | 6 (100) | 77.5 (14–91) | 77 |
Abbreviation: SSTI, skin and soft tissue infection.
aNumber at start of training period.
bProportion of training class who developed a SSTI.
cProportion with purulent SSTI among those with SSTI.
dProportion with USA300 methicillin-resistant Staphylococcus aureus (MRSA) SSTI among those with purulent SSTI; 6 individuals with recurrent USA300 MRSA SSTI were in classes F (n = 2), A (n = 1), C (n = 1), D (n = 1), and I (n = 1).