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.