Abstract：
:Swine-origin H1N1 influenza virus (S-OIV) appeared in 2009 with a higher incidence rate among children. Although fever was the most common symptom, some complicated cases occurred. We evaluated the percentages of effector T cells, B cells, and regulatory T cells in peripheral blood from 5 children infected by S-OIV (1 with acute necrotizing encephalitis, 2 with pneumonia, and 2 without complications), 5 children with seasonal influenza, and 5 healthy children. We found higher percentages of T-bet(+) CD4(+)CD8(+) T cells, monocytes, and B cells, granzyme B(+) and perforin(+) CD4(+), and CD8(+) T cells in affected children with both seasonal and H1N1 influenza than in controls, whereas both groups demonstrated similar percentages of CD4(+)CD25(+)Foxp3(+) regulatory T cells. In infected children with complications we observed high percentages of perforin(+) and interferon-γ(+) CD4(+) and CD8(+) T cells associated with low percentages of T regulatory cells. Our data suggest a dysregulation of antipathogen type I immune responses in complicated S-OIV infections.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Frisullo G,Iorio R,Plantone D,Nociti V,Patanella AK,Marti A,Palermo C,Valentini P,Mariotti P,Batocchi APdoi
10.1016/j.humimm.2011.04.006subject
Has Abstractpub_date
2011-08-01 00:00:00pages
632-5issue
8eissn
0198-8859issn
1879-1166pii
S0198-8859(11)00096-6journal_volume
72pub_type
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