The nonadaptive nature of the H1N1 2009 Swine Flu pandemic contrasts with the adaptive facilitation of transmission to a new host

Table 1 Estimated dates for the gene-specific ages of the root of the sampled H1N1 sequences, the divergence of the pandemic clade (MRCApandemic), and for the diversification of the 2009 pandemic sequences (Pandemic age).

	Root	95% HPD_root	MRCA_pandemic	${HPD}_{M R C A_{p a n d e m i c}}$	Pandemic age	95% HPD_pandemic
PB2	74.28	105.75-46.09	8.54	12.06-5.35	1.00	1.60-0.48
PB1	281.40	491.80-109.34	15.44	23.53-9.30	4.37	6.65-2.32
PA	79.71	111.65-49.45	13.56	19.67-7.88	1.03	1.58-0.56
HA	83.87	129.77-45.50	7.79	12.57-3.96	1.19	1.62-0.82
NP	55.39	95.16-22.36	7.88	11.34-5.08	0.93	1.60-0.37
NA	74.61	93.17-57.07	43.03	56.95-28.56	1.53	2.08-0.94
M2	29.51	39.69-19.98	14.76	20.99-8.72	1.30	1.31-1.20
M1	48.69	66.69-31.12	34.07	49.57-17.94	1.70	2.63-0.88
NS2	70.70	97.57-46.96	7.35	9.67-5.38	1.22	1.84-0.81
NS1	130.95	189.46-78.78	9.16	12.32-6.38	1.11	1.55-0.76

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