Table 1. Genetic diversity of A/H1N1pdm coding sequences sampled in Canada.

Viral Segment	Gene	NTa Substitutions per Gene Site	AAb Substitutions per Protein Site
1	PB2	2.14×10−4	2.32×10−4
2	PB1	1.64×10−3	1.47×10−3
3	PA	2.09×10−4	2.87×10−4
4	HA	1.56×10−3	1.98×10−3
5	NP	1.65×10−3	8.83×10−4
6	NA	1.67×10−3	2.36×10−3
7	M1	4.15×10−4	9.44×10−5
7	M2	1.17×10−4	1.74×10−4
8	NS1	2.53×10−4	6.19×10−4
8	NEP (NS2)	9.32×10−5	1.31×10−4

^aNT: nucleotide; in viruses sampled from 235 unique subjects;

^bAA: amino acid; in viruses sampled from 235 unique subjects;

Viral segments exhibiting highest genetic diversity are highlighted in bold font.