Evolutionary pattern of pandemic influenza (H1N1) 2009 virus in the late phases of the 2009 pandemic.
Influenza A( H1N1)v has spread rapidly in all parts of the globe in 2009 as a true pandemic, although fortunately a clinically mild one. The relevant evolutionary steps for the new virus to adapt to human populations occurred very early during the pandemic, before the end of April. Of the several resulting clades or clusters, clade 7 appeared later and proved more successful, substituting all other early clades before the bulk of the worldwide infections occurred.
Valli
Maria Beatrice
MB
INMI "L. Spallanzani" Rome; INMI "L. Spallanzani" Rome, Italy and INMI "L. Spallanzani" Roma.
Meschi
Silvia
S
Selleri
Marina
M
Zaccaro
Paola
P
Ippolito
Giuseppe
G
Capobianchi
Maria Rosaria
MR
Menzo
Stefano
S