Volume 15, Number 12—December 2009
CME ACTIVITY - Research
Community-associated Methicillin-Resistant Staphylococcus aureus in Outpatients, United States, 1999–2006
Eili Klein, David L. Smith, and Ramanan Laxminarayan
Table
Frequency of MRSA in hospitals, by unit, United States, 1999–2006*
| Unit | % Patients (95% confidence interval) |
|||||||
|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006† | |
| Outpatient | ||||||||
| All MRSA | 26.8 (26.3–27.3) | 29.4 (29.0–29.9) | 33.4 (33.0–33.9) | 35.7 (35.3–36.2) | 40.7 (40.2–41.2) | 47.7 (47.3–48.1) | 52.7 (52.3–53.1) | 52.4 (52.0–52.9) |
| HA-MRSA | 23.2 (23.0–23.5) | 25.1 (24.9–25.4) | 28.2 (28.0–28.5) | 28.4 (28.2–28.7) | 29.3 (29.0–29.5) | 28.4 (28.2–28.7) | 24.1 (23.8–24.3) | 24.2 (24.0–24.5) |
| Blood | 2.7 | 2.8 | 4.0 | 3.7 | 3.1 | 2.8 | 2.1 | 1.9 |
| Lungs | 4.7 | 5.3 | 6.5 | 5.5 | 5.4 | 4.2 | 3.5 | 2.9 |
| Skin | 9.3 | 10.6 | 10.1 | 11.6 | 13.8 | 15.5 | 14.2 | 15.5 |
| Other source | 6.4 | 6.5 | 7.6 | 7.7 | 7.0 | 6.0 | 4.2 | 4.0 |
| CA-MRSA | 3.6 (3.5–3.7) | 4.3 (4.2–4.4) | 5.2 (5.1–5.4) | 7.3 (7.1–7.5) | 11.4 (11.3–11.6) | 19.3 (19.1–19.5) | 28.7 (28.4–28.9) | 28.2 (28.0–28.5) |
| Blood | 0.3 | 0.3 | 0.6 | 0.7 | 0.8 | 0.8 | 0.9 | 0.8 |
| Lungs | 0.4 | 0.5 | 0.9 | 0.9 | 0.7 | 0.6 | 0.8 | 0.7 |
| Skin | 2.3 | 3.0 | 2.9 | 4.8 | 9.0 | 16.6 | 25.3 | 25.4 |
| Other source |
0.5 |
0.5 |
0.8 |
0.9 |
1.0 |
1.3 |
1.6 |
1.4 |
| Inpatient | ||||||||
| All MRSA | 46.7 (46.2–47.2) | 47.6 (47.2–48.1) | 50.0 (49.6–50.4) | 52.2 (51.8–52.6) | 54.9 (54.6–55.3) | 58.3 (57.9–58.6) | 59.5 (59.2–59.9) | 58.5 (58.0–58.9) |
| HA-MRSA | 43.4 (43.0–43.9) | 43.2 (42.8–43.6) | 44.1 (43.7–44.5) | 43.9 (43.5–44.3) | 44.1 (43.7–44.5) | 41.9 (41.6–42.3) | 38.5 (38.2–38.9) | 38.7 (38.3–39.1) |
| Blood | 7.1 | 7.2 | 7.5 | 7.5 | 7.5 | 7.0 | 6.2 | 6.3 |
| Lungs | 21.4 | 19.9 | 19.2 | 18.5 | 17.6 | 16.5 | 14.7 | 14.5 |
| Skin | 9.3 | 10.5 | 11.4 | 12.0 | 12.9 | 13.1 | 13.0 | 13.1 |
| Other source | 5.6 | 5.6 | 6.0 | 5.9 | 6.1 | 5.3 | 4.5 | 4.7 |
| CA-MRSA | 3.3 (3.1–3.4) | 4.5 (4.3–4.6) | 5.8 (5.6–6.0) | 8.4 (8.2–8.6) | 10.9 (10.6–11.1) | 16.3 (16.1–16.6) | 21.0 (20.7–21.3) | 19.8 (19.4–20.1) |
| Blood | 0.6 | 0.7 | 1.0 | 1.2 | 1.2 | 1.7 | 2.1 | 2.0 |
| Lungs | 1.2 | 1.6 | 2.1 | 2.3 | 2.1 | 2.6 | 3.3 | 3.8 |
| Skin | 1.1 | 1.7 | 2.1 | 4.0 | 6.6 | 10.9 | 14.4 | 12.8 |
| Other source | 0.4 | 0.5 | 0.7 | 0.9 | 1.0 | 1.2 | 1.3 | 1.2 |
*MRSA, methicillin-resistant Staphylococcus aureus; HA-MRSA, hospital-associated MRSA; CA-MRSA, community-associated MRSA.
†Data through October only. Data for blood, lungs, skin, and other source refer to the percentage of each source tested that was estimated to be CA-MRSA or HA-MRSA.
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