title: Safety and immunogenicity of a novel nanoemulsion mucosal adjuvant W805EC combined with approved seasonal influenza antigens.
abstract: BACKGROUND
  Improving the systemic and mucosal immune response following intranasal vaccination could enhance disease protection against respiratory pathogens. We assessed the safety and immunogenicity of a novel nanoemulsion mucosal adjuvant W(80)5EC combined with approved seasonal influenza antigens.
  
  
  METHODS
  This was a first-in-human Phase I study in 199 healthy adult volunteers randomized to receive a single intranasal administration of 5%, 10%, 15% or 20% W(80)5EC, combined with 4 or 10 μg strain-specific Fluzone(®) HA, compared with intranasal PBS, intranasal Fluzone(®), or 15 ug strain-specific intramuscular Fluzone(®). Safety was evaluated by physical examination, laboratory parameters, symptom diaries, and adverse event reports. Serum HAI titers and nasal wash IgA were assessed at baseline as well as 28 and 60 days after vaccination.
  
  
  RESULTS
  W(80)5EC adjuvant combined with seasonal influenza antigens was well tolerated without safety concerns or significant adverse events. The highest dose of 20% W(80)5EC combined with 10 μg strain-specific HA elicited clinically meaningful systemic immunity based on increases in serum HAI GMT and ≥ 70% seroprotection for all 3 influenza strains, as well as a rise in antigen-specific IgA in nasal wash specimens.
  
  
  CONCLUSIONS
  W(80)5EC adjuvant was safe and well tolerated in healthy adult volunteers and elicited both systemic and mucosal immunity following a single intranasal vaccination.
authors.affiliation: Department of Pediatrics, Columbia University, New York, NY, USA.
authors.forename: L R
authors.initials: LR
authors.lastname: Stanberry
authors.forename: J K
authors.initials: JK
authors.lastname: Simon
authors.forename: C
authors.initials: C
authors.lastname: Johnson
authors.forename: P L
authors.initials: PL
authors.lastname: Robinson
authors.forename: J
authors.initials: J
authors.lastname: Morry
authors.forename: M R
authors.initials: MR
authors.lastname: Flack
authors.forename: S
authors.initials: S
authors.lastname: Gracon
authors.forename: A
authors.initials: A
authors.lastname: Myc
authors.forename: T
authors.initials: T
authors.lastname: Hamouda
authors.forename: J R
authors.initials: JR
authors.lastname: Baker
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage / Q000009:adverse effects*; D000281:Administration, Intranasal; D058956:Administration, Mucosal; D000328:Adult; D000914:Antibodies, Viral / Q000032:analysis / Q000097:blood; D000956:Antigens, Viral / Q000008:administration & dosage / Q000009:adverse effects* / Q000276:immunology*; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006805:Human Experimentation; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000009:adverse effects* / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D009297:Nasal Mucosa / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D000914:Antibodies, Viral; D000956:Antigens, Viral; D007070:Immunoglobulin A; D007252:Influenza Vaccines