Volume 15, Number 10—October 2009
CME ACTIVITY - Research
Community-Associated Methicillin-Resistant Staphylococcus aureus, Iowa, USA
Table 2
Descriptive epidemiology of invasive MRSA in Iowa, USA, 2006*
Characteristic† | Total no. (%), N = 343 | USA type |
p value | |
---|---|---|---|---|
No. (%) USA300/400, n = 54 | No. (%) other,‡ n = 289 | |||
Mean age, y | 66.3 (SD = 17.0) | 50.6 (SD = 21.2) | 69.2 (SD = 14.4) | <0.0001 |
Female gender | 135 (39.4) | 14 (25.9) | 121 (41.9) | 0.059 |
Inpatient stay | 278 (81.0) | 50 (92.6) | 228 (78.9) | 0.271 |
ICU admission | 56 (16.3) | 8 (14.8) | 48 (16.7) | 0.348 |
Nosocomial infection |
57 (16.6) |
1 (1.9) |
56 (19.4) |
0.0006 |
Specimen type | 0.0021 | |||
Blood | 322 (93.9) | 45 (83.3) | 276 (95.0) | |
CSF | 0 | 0 | 0 | |
Joint fluid | 13 (3.8) | 5 (9.3) | 8 (2.9) | |
Pleural fluid | 2 (0.6) | 2 (3.7) | 0 | |
Other |
6 (1.7) |
2 (3.7) |
5 (1.4) |
|
Iowa region | 0.268 | |||
1 | 10 (2.9) | 0 | 10 (3.5) | |
2 | 93 (27.0) | 13 (24.1) | 80 (27.7) | |
3 | 49 (14.2) | 12 (22.2) | 37 (12.8) | |
4 | 105 (30. 5) | 16 (29.6) | 88 (30.5) | |
6 |
20 (5.8) |
5 (9.3) |
15 (5.2) |
|
PVL |
54 (15.7) |
52 (96.3) |
2 (0.7)§ |
<0.0001 |
SCCmec IV | 68 (19.8) | 54 (100.0) | 13 (4.5) | <0.0001 |
*MRSA, methicillin-resistant Staphylococcus aureus; ICU, intensive care unit; CSF, cerebrospinal fluid; PVL, Panton-Valentine leukocidin; SCCmec IV, Staphylococcal chromosomal cassette mec type IV.
†The number of patients missing data on specific variables: age = 10; gender = 12; inpatient = 31; ICU = 122; nosocomial = 101; specimen type = 0; Iowa Department of Public Health Reporting Region = 6; PVL = 3; SCCmec IV = 3.
‡Of the subset of isolates that were typed (N = 272) 94% were USA100. The remainder clustered with USA200 (5), USA500 (5), USA600 (1), USA800 (4), or did not match an existing USA type.
§Both isolates clustered with USA100 and were SCCmecII.