Volume 18, Number 5—May 2012
Dispatch
Human Infections with Novel Reassortant Influenza A(H3N2)v Viruses, United States, 2011
Stephen Lindstrom, Rebecca Garten, Amanda Balish, Bo Shu, Shannon Emery, LaShondra Berman, Nathelia Barnes, Katrina Sleeman, Larisa Gubareva, Julie Villanueva, and Alexander Klimov
Table 2
Hemagglutinin-inhibition assay results, including the 6 available influenza A(H3N2)v viruses isolated in 2011, United States*
| Influenza virus strain (culture method) | Titers to reference ferret antiserum |
Specimen collection date | |||||||
|---|---|---|---|---|---|---|---|---|---|
| PER/16 | KS/13 | WI/12 | PA/14 | MN/11 | X203 | IN/08 | IN/10 | ||
| A/Perth/16/2009 (egg)† | 1,280 | <10 | <10 | <10 | 20 | 20 | <10 | <10 | 2009 Apr 7 |
| A/Kansas/13/2009 (MDCK cells) | <10 | 640 | 80 | 160 | 40 | 40 | 40 | 80 | 2009 Jul 29 |
| A/Wisconsin/12/2010 (MDCK cells) | <10 | 40 | 1,280 | 320 | 640 | 320 | 640 | 1,280 | 2010 Sep 10 |
| A/Pennsylvania/14/2010 (egg) | <10 | 160 | 320 | 640 | 320 | 320 | 640 | 640 | 2010 Oct 26 |
| A/Minnesota/11/2010 (egg) | <10 | <10 | 320 | 160 | 640 | 1,280 | 320 | 160 | 2010 Nov 26 |
| A/Minnesota/11/2010 X-203 (egg)‡ | 10 | <10 | 80 | 40 | 320 | 640 | 160 | 80 | Not applicable |
| A/Indiana/08/2011 (MDCK cells)* | <10 | 10 | 1,280 | 640 | 640 | 320 | 1,280 | 1,280 | 2011 Jul 24 |
| A/Indiana/10/2011 (MDCK cells)* | <10 | 40 | 1,280 | 320 | 1,280 | 640 | 1,280 | 1,280 | 2011 Oct 22 |
| A/Indiana/10/2011 (egg)* | <10 | 10 | 1,280 | 320 | 640 | 320 | 1,280 | 1,280 | 2011 Oct 22 |
| A/Iowa/07/2011 (MDCK cells)* | <10 | 10 | 1,280 | 640 | 1,280 | 640 | 1,280 | 2,560 | 2011 Nov 14 |
| A/Iowa/08/2011 (MDCK cells)* | <10 | 40 | 1,280 | 640 | 640 | 640 | 1,280 | 2,560 | 2011 Nov 14 |
| A/Iowa/09/2011 (MDCK cells)* | <10 | 40 | 1,280 | 640 | 1,280 | 640 | 2560 | 2,560 | 2011 Nov 14 |
*Influenza A(H3N2)v, virus variant identified in humans, United States, 2011. Gray shading indicates antigenically similar viruses.
†Current seasonal influenza A(H3N2) vaccine virus.
‡Reassortant virus possessing the hemagglutinin and neuraminidase genes of A/Minnesota/11/2010 and the remaining 6 genes of A/PR/8/34.
