Key result
EV-A71 vaccine candidate strains demonstrated good immunogenicity in mice, inducing NTAb titers ranging from 1:94 to 1:346 and seroconversion rates above 80% after one immunization.
Why the study?
This study aimed to evaluate enterovirus 71 vaccine candidate strains, including their genotypes, immunogenicity, and cross-neutralization capacity.
Supports EV-A71 candidate advancement in preclinical models; leaves open human immunogenicity and efficacy.
Objective: This study aimed to evaluate enterovirus 71 (EV-A71) vaccine candidate strains, including their genotypes, immunogenicity and cross-neutralization capacity. Methods: From clinical samples, EV-A71 strains were separated by using Vero cells. Six strains were chosen for vaccine candidates, and the sequences were analyzed. To detect the immunogenicity of the strains, we used them to immunize NIH mice at 0 and 14 days. Cytopathic effects (CPE) were examined to determine the EV-A71 neutralizing antibody (NTAb) titer 14 d after the first and second inoculations. To evaluate the cross-neutralizing capacity of the EV-A71 vaccine candidate strains, we tested serum immunized mice with ten EV-A71 genotype strains. Results: Six EV-A71 vaccine candidate strains were identified, all belonging to sub-genotype C4, the prevalent genotype in China. The sequence similarity of the VP1 regions of the six candidate vaccine strains and three approved inactivated vaccines was 97.58%–97.77%, and the VP1 amino acid similarity was 98.65%–99.33%. Experiments were performed to evaluate the immunogenicity and cross-neutralizing activity of the EV-A71 vaccine candidate strains. The strains had good immunogenicity 14 d after two immunizations, inducing an NTAb titer ranging from 1:94 to 1:346. The NTAb seroconversion rates 14 d after one immunization were above 80% (except HB0007), and significantly increased immunogenicity of EV-A71 strains was observed post-inoculation. Furthermore, our candidate vaccine strains had broad cross-neutralizing activity after challenge with ten sub-genotypes of EV-A71. The highest NTAb titer/lowest NTAb titer ratios of sera against EV-A71 sub-genotypes were 8.0 (JS0002), 8.0 (JS0005), 21.3 (HB0005), 21.3 (HB0007), 10.7 (HB0040) and 8.0 (GD0002), respectively. Conclusions: Our EV-A71 strains had good immunogenicity and cross-neutralization activity, and have the potential to serve as vaccine strains for multivalent hand, foot and mouth disease vaccines.
No takes yet. Share an insight, caveat, or question.
Xiao et al. (2021) studied Enterovirus 71 (EV-A71) infection. EV-A71 vaccine candidate strains was evaluated on EV-A71 neutralizing antibody (NTAb) seroconversion rates 14 days after one immunization. EV-A71 vaccine candidate strains demonstrated good immunogenicity in mice, inducing NTAb titers ranging from 1:94 to 1:346 and seroconversion rates above 80% after one immunization.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: