The group distances for HA-1 of AIV-H5N1 from
chicken farms when comparing 2008–2009, 2008–2010 and 2009–
2010 were 0.042 (SD = 0.003), 0.047 (SD = 0.004), and 0.039
(SD = 0.003), respectively. The value derived from Tajima’s
neutrality test (D) was 1.157.