The purpose of this phase I/II trial is to evaluate safety and tolerability of a single dose of GHB16L2 administered by liquid nasal spray for vaccination against seasonal influenza virus infection. It is also performed to assess immunogenicity and pharmacokinetics (shedding).

GHB16L2 intends to provide a novel vaccination for influenza virus infection. 80 healthy volunteers will be included at a ratio of 1:1 for GHB16L2 or placebo. GHB16L2 will be administered once on day 1. Follow-up visits will be performed on days 2, 8 and 29.

Inclusion Criteria:

• Healthy male and female volunteers, 18-60 years
• Seronegative for one or two of the applied vaccine strains
• Low antibody titres for H1N1v
• Written informed consent to participate in this study
• For female volunteers of childbearing potential, provision of a history and current use of reliable contraceptive practices

Exclusion Criteria:

• Acute febrile illness (>37.3°C)
• Signs of acute or chronic upper or lower tract respiratory illnesses
• History of severe atopy
• Seasonal influenza vaccination in 2008/2009 and/or later seasons and/or pandemic influenza vaccination at any time
• Fever ≥38.0°C in the time period between the pre-screening visit and day 1
• Known increased tendency of nose bleeding
• Volunteers with clinically relevant abnormal paranasal anatomy
• Volunteers with clinically relevant abnormal laboratory values
• In female volunteers of childbearing potential, a positive urine pregnancy test
• Simultaneous treatment with immunosuppressive drugs incl. Corticosteroids (≥2 weeks) within 4 weeks prior to study medication application
• Clinically relevant history of renal, hepatic, GI, cardiovascular, haematological, skin, endocrine, neurological or immunological diseases
• History of leukaemia or cancer
• HIV or Hepatitis B or C seropositivity
• Volunteers who underwent rhino or sinus surgery, or surgery of another traumatic injury of the nose within 30 days prior to application of study medication
• Volunteers who have received antiviral drugs, treatment with immunoglobulins or blood transfusions, or an investigational drug within 4 weeks prior to study medication application
• Volunteers who have received anti-inflammatory drugs 2 days prior to study medication application
• Volunteers who are not likely to cope with the requirements of the study or with a significant physical or mental condition that may interfere with the completion of the study