Aaron D. Storms, Larisa V. Gubareva, Su Su, John T. Wheeling, Margaret Okomo-Adhiambo, Chao-Yang Pan, Erik Reisdorf, Kirsten St. George, Robert Myers, Jason T. Wotton, Sara Robinson, Brandon Leader, Martha Thompson, Marjorie Shannon, Alexander Klimov, Alicia M. Fry

, and for the US Antiviral Resistance Surveillance Working Group
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (A.D. Storms, L.V. Gubareva, S. Su, J.T. Wheeling, M. Okomo-Adhiambo, A. Klimov, A.M. Fry); California Department of Public Health, Sacramento, California, USA (C.-Y. Pan); Wisconsin State Laboratory of Hygiene, Madison, Wisconsin, USA (E. Reisdorf); New York State Department of Health, Albany, New York, USA (K. St. George); Maryland Department of Health and Mental Hygiene, Baltimore, Maryland, USA (R. Myers); Minnesota Department of Health, Saint Paul, Minnesota, USA (J.T. Wotton); Maine Department of Health and Human Services, Augusta, Maine, USA (S. Robinson); Washington State Department of Health, Shoreline, Washington, USA (B. Leader); Texas Department of State Health Services, Austin, Texas, USA (M. Thompson); Delaware Health and Social Services, New Castle, Delaware, USA (M. Shannon)
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Table 2
Temporal trends of oseltamivir-resistant pandemic (H1N1) 2009 viruses and history of patient exposure to oseltamivir, by month, United States, October 1, 2010–July 31, 2011
| Year and month of specimen collection |
No. specimens tested |
No. (%) oseltamivir-resistant specimens |
No. (%) patients with oseltamivir-resistant virus but no oseltamivir exposure |
| 2010 Oct |
9 |
0 |
0 |
| 2010 Nov |
17 |
0 |
0 |
| 2010 Dec |
172 |
1 (0.6) |
0 |
| 2011 Jan |
1,074 |
6 (0.6) |
4 (66.7) |
| 2011 Feb |
1,475 |
18 (1.2) |
15 (83.3) |
| 2011 Mar |
801 |
9 (1.1) |
6 (66.7) |
| 2011 Apr |
95 |
1 (1.0) |
1 (100.0) |
| 2011 May |
8 |
0 |
0 |
| 2011 Jun |
0 |
0 |
0 |
| 2011 Jul |
1 |
0 |
0 |
| Total |
3,652 |
35 (1.0) |
25 (73.5)* |
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