tetano
Editor, Senior Moderator
Vaccines (Basel)
. 2020 Jul 20;8(3):E393.
doi: 10.3390/vaccines8030393.
A Randomized Controlled Study to Evaluate the Safety and Reactogenicity of a Novel rVLP-Based Plant Virus Nanoparticle Adjuvant Combined with Seasonal Trivalent Influenza Vaccine Following Single Immunization in Healthy Adults 18-50 Years of Age
Joanne Langley[SUP] 1 2 [/SUP], Elodie Pastural[SUP] 3 [/SUP], Scott Halperin[SUP] 1 2 4 [/SUP], Shelly McNeil[SUP] 1 2 [/SUP], May ElSherif[SUP] 1 [/SUP], Donna MacKinnon-Cameron[SUP] 1 [/SUP], Lingyun Ye[SUP] 1 [/SUP], C?cile Grange[SUP] 5 6 [/SUP], Val?rie Thibodeau[SUP] 5 6 [/SUP], Jean-Fran?ois Cailhier[SUP] 5 6 7 [/SUP], Rejean Lapointe[SUP] 5 6 7 [/SUP], Janet McElhaney[SUP] 8 [/SUP], Luis Martin[SUP] 3 [/SUP], Maril?ne Bolduc[SUP] 9 [/SUP], Marie-Eve Lalibert?-Gagn?[SUP] 9 [/SUP], Denis Leclerc[SUP] 9 [/SUP], Pierre Savard[SUP] 10 [/SUP]
Affiliations
Abstract
Inactivated influenza vaccines efficacy is variable and often poor. We conducted a phase 1 trial (NCT02188810), to assess the safety and immunogenicity of a novel nanoparticle Toll-like receptor 7/8 agonist adjuvant (Papaya Mosaic Virus) at different dose levels combined with trivalent influenza vaccine in healthy persons 18-50 years of age. Hemagglutination-inhibition assays, antibody to Influenza A virus nucleoprotein and peripheral blood mononuclear cells for measurement of interferon-gamma ELISPOT response to influenza antigens, Granzyme B and IFNγ:IL-10 ratio were measured. The most common adverse events were transient mild to severe injection site pain and no safety signals were observed. A dose-related adjuvant effect was observed. Geometric mean hemagglutination-inhibition titers increased at day 28 in most groups and waned over time, but fold-antibody responses were poor in all groups. Cell mediated immunity results were consistent with humoral responses. The Papaya Mosaic Virus adjuvant in doses of 30 to 240 ?g combined with reduced influenza antigen content was safe with no signals up to 3 years after vaccination. A dose-related adjuvant effect was observed and immunogenicity results suggest that efficacy study should be conducted in influenza antigen-na?ve participants.
Keywords: adjuvants; immunogenicity; influenza vaccines.
. 2020 Jul 20;8(3):E393.
doi: 10.3390/vaccines8030393.
A Randomized Controlled Study to Evaluate the Safety and Reactogenicity of a Novel rVLP-Based Plant Virus Nanoparticle Adjuvant Combined with Seasonal Trivalent Influenza Vaccine Following Single Immunization in Healthy Adults 18-50 Years of Age
Joanne Langley[SUP] 1 2 [/SUP], Elodie Pastural[SUP] 3 [/SUP], Scott Halperin[SUP] 1 2 4 [/SUP], Shelly McNeil[SUP] 1 2 [/SUP], May ElSherif[SUP] 1 [/SUP], Donna MacKinnon-Cameron[SUP] 1 [/SUP], Lingyun Ye[SUP] 1 [/SUP], C?cile Grange[SUP] 5 6 [/SUP], Val?rie Thibodeau[SUP] 5 6 [/SUP], Jean-Fran?ois Cailhier[SUP] 5 6 7 [/SUP], Rejean Lapointe[SUP] 5 6 7 [/SUP], Janet McElhaney[SUP] 8 [/SUP], Luis Martin[SUP] 3 [/SUP], Maril?ne Bolduc[SUP] 9 [/SUP], Marie-Eve Lalibert?-Gagn?[SUP] 9 [/SUP], Denis Leclerc[SUP] 9 [/SUP], Pierre Savard[SUP] 10 [/SUP]
Affiliations
- PMID: 32698532
- DOI: 10.3390/vaccines8030393
Abstract
Inactivated influenza vaccines efficacy is variable and often poor. We conducted a phase 1 trial (NCT02188810), to assess the safety and immunogenicity of a novel nanoparticle Toll-like receptor 7/8 agonist adjuvant (Papaya Mosaic Virus) at different dose levels combined with trivalent influenza vaccine in healthy persons 18-50 years of age. Hemagglutination-inhibition assays, antibody to Influenza A virus nucleoprotein and peripheral blood mononuclear cells for measurement of interferon-gamma ELISPOT response to influenza antigens, Granzyme B and IFNγ:IL-10 ratio were measured. The most common adverse events were transient mild to severe injection site pain and no safety signals were observed. A dose-related adjuvant effect was observed. Geometric mean hemagglutination-inhibition titers increased at day 28 in most groups and waned over time, but fold-antibody responses were poor in all groups. Cell mediated immunity results were consistent with humoral responses. The Papaya Mosaic Virus adjuvant in doses of 30 to 240 ?g combined with reduced influenza antigen content was safe with no signals up to 3 years after vaccination. A dose-related adjuvant effect was observed and immunogenicity results suggest that efficacy study should be conducted in influenza antigen-na?ve participants.
Keywords: adjuvants; immunogenicity; influenza vaccines.