Similar immunogenicity of the A/H1N1 2009 pandemic influenza strain when used as a monovalent or a trivalent vaccine.

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Abstract
The WHO recommended including the A (H1N1) 2009 pandemic strain in the influenza vaccines for use in the 2010-2011 northern hemisphere (NH) influenza season. The immunogenicity and safety of the trivalent split inactivated vaccine (Vaxigrip®) NH 2010-2011 formulation was compared to that observed for the corresponding non-adjuvanted monovalent A (H1N1) pandemic vaccine (Panenza®), when tested in similar populations of adult and elderly volunteers.