Volume 15, Number 6—June 2009
CME ACTIVITY
Past, Present, and Possible Future Human Infection with Influenza Virus A Subtype H7
Jessica A. Belser, Carolyn B. Bridges, Jacqueline M. Katz, and Terrence M. Tumpey
Table
Cases of human subtype H7 influenza A virus infection since 1996*
| Location | Year | Subtype | IVPI | No. human infections | Symptoms | References |
|---|---|---|---|---|---|---|
| UK (England) | 1996 | H7N7 | LPAI | 1 | Conjunctivitis | (8,9) |
| USA (Virginia) | 2002 | H7N2 | LPAI | 1† | Respiratory | (10) |
| USA (New York) | 2003 | H7N2 | LPAI | 1 | Respiratory | (11) |
| Italy | 2002–03 | H7N3 | LPAI | 7† | Conjunctivitis, respiratory | (12) |
| The Netherlands | 2003 | H7N7 | HPAI | 89 | Conjunctivitis, respiratory | (6,13) |
| Canada (British Columbia) | 2004 | H7N3 | LPAI/HPAI | 2 | Conjunctivitis, respiratory | (14,15) |
| UK (Norfolk) | 2006 | H7N3 | LPAI | 1 | Conjunctivitis | (16) |
| UK (Wales) | 2007 | H7N2 | LPAI | 4 | Conjunctivitis, respiratory | (17) |
*IVPI, intravenous pathogenicity index (1); LPAI, low pathogenicity avian influenza; HPAI, highly pathogenic avian influenza.
†Serologic evidence only.
