Comparative B cell and antibody responses induced by adenoviral vectored and mRNA vaccines against COVID-19.
Journal
medRxiv : the preprint server for health sciences
Titre abrégé: medRxiv
Pays: United States
ID NLM: 101767986
Informations de publication
Date de publication:
05 Jun 2023
05 Jun 2023
Historique:
pubmed:
19
6
2023
medline:
19
6
2023
entrez:
19
6
2023
Statut:
epublish
Résumé
Both vector and mRNA vaccines were an important part of the response to the COVID-19 pandemic and may be required in future outbreaks and pandemics. However, adenoviral vectored (AdV) vaccines may be less immunogenic than mRNA vaccines against SARS-CoV-2. We assessed anti-spike and anti-vector immunity among infection-naïve Health Care Workers (HCW) following two doses of AdV (AZD1222) versus mRNA (BNT162b2) vaccine. 183 AdV and 274 mRNA vaccinees enrolled between April and October 2021. Median ages were 42 and 39 years, respectively. Blood was collected at least once, 10-48 days after vaccine dose 2. Surrogate virus neutralization test (sVNT) and spike binding antibody titres were a median of 4.2 and 2.2 times lower, respectively, for AdV compared to mRNA vaccinees (p<0.001). Median percentages of memory B cells that recognized fluorescent-tagged spike and RBD were 2.9 and 8.3 times lower, respectively for AdV compared to mRNA vaccinees. Titres of IgG reactive with human Adenovirus type 5 hexon protein rose a median of 2.2-fold after AdV vaccination but were not correlated with anti-spike antibody titres. Together the results show that mRNA induced substantially more sVNT antibody than AdV vaccine due to greater B cell expansion and targeting of the RBD. Pre-existing AdV vector cross-reactive antibodies were boosted following AdV vaccination but had no detectable effect on immunogenicity.
Identifiants
pubmed: 37333329
doi: 10.1101/2023.06.02.23290871
pmc: PMC10275006
pii:
doi:
Types de publication
Preprint
Langues
eng
Subventions
Organisme : NIAID NIH HHS
ID : R01 AI141534
Pays : United States
Déclaration de conflit d'intérêts
AF reports research funding from Sanofi. HM reports research funding from bioCSL, Pfizer, and GlaxoSmithKline. PW reports research funding from GlaxoSmithKline, Krystal Australia Pty Ltd, Vertex Pharmaceuticals, and Sanofi. SGS reports honoraria from Pfizer and CSL Seqirus.