Non-Inferiority Study Comparing the Subunit Vaccines Influvac and Agrippal in China

Inclusion Criteria: * signed and dated informed consent * being healthy * mental health enough to understand the study, the informed consent form and the questionnaire Exclusion Criteria: * known to be allergic to constituents of the vaccine * having an autoimmune disorder, taking immunomodulating drugs or having immune disfunction secondary to HIV * having had a documented serious adverse reaction to previous influenza vaccination * having had documented influenza infection or vaccination in the six months prior to the start of the study * having received any other vaccines, immunoglobulins or investigational drugs in the month prior to the start of the study