TABLE 1.

Distribution of H5N1 viruses with NA sequences with shortened stalks isolated from different species from 1996 to 2007a

Year(s)% H5N1 viruses isolated fromb:
Gallinaceous poultry (n = 466)Domestic waterfowl (n = 328)Wild birds (n = 172)Humans (n = 162)
1996 to 19997550NA100
2000NA16NANA
20014245NANA
2002896767NA
200395947133
2004977184100
200510010090100
20061009498100
2007100100100100
1996 to 200792819099
  • a Sequence data was obtained from National Center for Biotechnology Information (NCBI).

  • b Each number is shown as a percentage of H5N1 viruses isolated in the indicated year that had a short NA stalk. NA, no sequence data available.