Vaccine Development


Last updated: 2022 Apr 29
Total hit(s): 18
Select item(s)
Key Findings
Comments
(You can add your comments too!)
Original Article
(hover to see details)
A greater vaccine dose may be necessary for upper respiratory tract protection than for lower respiratory tract protection. Suboptimal vaccine dose levels resulted in NSs losing protection but not enhanced viral replication as compared to the sham controls. Although additional mechanisms may possibly lead to worsened disease, suboptimal vaccination dose levels resulted in viral breakthroughs but did not result in increased viral replication or pathology in the lungs of vaccinated animals as compared to sham controls.
34133941
(Cell)
PMID
34133941
Date of Publishing: 2021 Jun 24
Title Low-dose Ad26.COV2.S protection against SARS-CoV-2 challenge in rhesus macaques
Author(s) nameHe X, Chandrashekar A et al.
Journal Cell
Impact factor
27.35
Citation count: 20
Date of Entry 2022 Apr 29


Protective effectiveness was linked to both RBD-specific activated memory B cells and binding or neutralising antibody responses. Furthermore, lesser vaccine doses resulted in lowered antibody responses and protective effectiveness. Although additional mechanisms may possibly lead to worsened illness, suboptimal vaccination dose levels resulted in viral breakthroughs but did not result in higher viral replication or pathology in the lungs of vaccinated animals compared to sham controls.
34133941
(Cell)
PMID
34133941
Date of Publishing: 2021 Jun 24
Title Low-dose Ad26.COV2.S protection against SARS-CoV-2 challenge in rhesus macaques
Author(s) nameHe X, Chandrashekar A et al.
Journal Cell
Impact factor
27.35
Citation count: 20
Date of Entry 2022 Apr 29


Intranasal challenge with SARS-CoV-2 virus protected the immunised hamsters (either a single-dose or a prime/boost vaccination regimen). Two doses of vaccine elicited more potent neutralising antibody response and reduced peak and total virus shedding by a greater level. Low levels of detectable virus was observed in the nasal turbinate tissue while lungs were completely clear from virus. After two doses, MF59-vaccinated hamsters showed an apparent reduction in viral load in the lungs and nasal turbinate tissues. In an animal model, neutralised antibody level is correlated with reduced virus shedding.
33841880
(Clin Transl Immunology)
PMID
33841880
Date of Publishing: 2021
Title Preclinical development of a molecular clampstabilised subunit vaccine for severe acute respiratory syndrome coronavirus 2
Author(s) nameWatterson D, Wijesundara DK et al.
Journal Clin Transl Immunology
Impact factor
8.18
Citation count: 16
Date of Entry 2022 Apr 29


Two doses of MF59-adjuvanted S-clamp regimen showed better immunogenicity and neutralised SARS-CoV-2 at ~2 fold higher than the reference serum. It effectively elicited highest magnitude and broadest S-specific Th cell and CTL responses compared to antigen only and placebo control groups. Due to the exclusion of the immunodominant region (aa577-aa618), the cross reactivity of clamp response to HIV-1 GP41 present in some diagnostic reagents was considered to have minimum impact
33841880
(Clin Transl Immunology)
PMID
33841880
Date of Publishing: 2021
Title Preclinical development of a molecular clampstabilised subunit vaccine for severe acute respiratory syndrome coronavirus 2
Author(s) nameWatterson D, Wijesundara DK et al.
Journal Clin Transl Immunology
Impact factor
8.18
Citation count: 16
Date of Entry 2022 Apr 29


In mice and nonhuman primates, intramuscular vaccination with ARCoV mRNA-LNP generated significant neutralising antibodies against SARS-CoV-2 as well as a Th1-biased cellular response. In mice, two doses of ARCoV immunisation provided full protection against a SARS-CoV-2 mouse-adapted strain. Immunized mice were fully protected against SARS-CoV-2 infection with no detectable viral RNA in the lungs or trachea, whereas high levels of viral RNA was observed in the lungs and trachea of placebo-treated mice. A single dosage of ARCoV immunisation resulted in an anamnestic antibody response, however two doses of ARCoV immunisation did not result in an increase in neutralising antibody titers upon challenge, suggesting that sterilising immunity was produced in mice.
32795413
(Cell)
PMID
32795413
Date of Publishing: 2020 Sep 3
Title A Thermostable mRNA Vaccine against COVID-19
Author(s) nameZhang NN, Li XF et al.
Journal Cell
Impact factor
27.35
Citation count: 191
Date of Entry 2022 Apr 29


In mice and non-human primates, two doses of intramuscular vaccination with ARCoV mRNA-LNP generated significant neutralising antibodies against SARS-CoV-2 as well as a Th1-biased cellular response compared to placebo control groups. Vaccine-elicited serum neutralizing antibody titers are immune correlates of protection against SARS-CoV-2 challenge.100 g of ARCoV is sufficient to induce high-level neutralizing antibodies and 1,000 g of ARCoV did not cause obvious adverse effects, highlighting the safety of the formulation. This mRNA-LNP formulation is stable at 4C and 25C for at least 7 days.Storage at 37C for 7 days only resulted in an 13% reduction in relative photon flux.This indicates high thermostability of the ARCoV vaccine.
32795413
(Cell)
PMID
32795413
Date of Publishing: 2020 Sep 3
Title A Thermostable mRNA Vaccine against COVID-19
Author(s) nameZhang NN, Li XF et al.
Journal Cell
Impact factor
27.35
Citation count: 191
Date of Entry 2022 Apr 29


Olive baboons immunized with adjuvanted NVX-CoV2373 showed high titer Anti-S antibodies with good neutralizing activity and blocked the hACE-2 receptor. NVX-CoV2373 vaccine induced binding and functional antibodies in a nonhuman primate at levels comparable or higher than individuals recovered from COVID-19 and is a promisin vaccine candidate
33446655
(Nat Commun)
PMID
33446655
Date of Publishing: 2021 Jan 14
Title SARS-CoV-2 spike glycoprotein vaccine candidate NVX-CoV2373 immunogenicity in baboons and protection in mice
Author(s) nameTian JH, Patel N et al.
Journal Nat Commun
Impact factor
11.8
Citation count: 142
Date of Entry 2021 Nov 12


Mice immunized with adjuvanted NVX-CoV2373 had significantly higher anti-S IgG titers with good neutralizing activity and blocked the hACE-2 receptor. Mice immunized with adjuvanted vaccine (both single and booster dose) were significantly protected from weight loss when compared to the palcebo treated mice.
33446655
(Nat Commun)
PMID
33446655
Date of Publishing: 2021 Jan 14
Title SARS-CoV-2 spike glycoprotein vaccine candidate NVX-CoV2373 immunogenicity in baboons and protection in mice
Author(s) nameTian JH, Patel N et al.
Journal Nat Commun
Impact factor
11.8
Citation count: 142
Date of Entry 2021 Nov 12


A multi-epitope vaccine was designed based on reverse-vaccinology approach. This vaccine was able to elicit a humoral and cellular immune response against SARS-CoV-2 infection.
33264668
(Infect Genet Evol)
PMID
33264668
Date of Publishing: 2020 Nov 29
Title Scrutinizing the SARS-CoV-2 protein information for designing an effective vaccine encompassing both the T-cell and B-cell epitopes
Author(s) nameJain N, Shankar U et al.
Journal Infect Genet Evol
Impact factor
2.67
Citation count: 6
Date of Entry 2021 Nov 12


SARS-CoV-2 RBD219-N1C1 vaccine candidate induced high titers of IgG virus-neutralizing antibodies and T-cell responses in immunized mice. The vaccine was also able to induce high levels of IFN-gamma, IL-6 and IL-12 cytokines. The deleted and altered residues are structurally distinct from immunogenic epitopes, particularly the RBD's receptor-binding motif (RBM). There was no correlation between the amount of Alhydrogel to which the RBD was bound and the interaction with hACE-2-Fc, implying that the RBD proteins' surface density on the Alhydrogel had no effect on the presentation of ACE binding sites.
33847226
(Hum Vaccin Immunother)
PMID
33847226
Date of Publishing: 2021 Apr 13
Title SARSCoV-2 RBD219-N1C1: A yeast-expressed SARS-CoV-2 recombinant receptor-binding domain candidate vaccine stimulates virus neutralizing antibodies and T-cell immunity in mice
Author(s) namePollet J, Chen WH et al.
Journal Hum Vaccin Immunother
Impact factor
4.7
Citation count: 20
Date of Entry 2021 Oct 31


Immunization of mice (C57BL/6 and BALB/c strains) and Pigs with RBD-SpyVLP vaccine showed strong dose-dependent neutralising antibody response. The polyclonal antibody response could recognize key epitopes on RBD (Receptor-Binding Domain). Besides, this vaccine is found to be thermostable making it easier for transportation globally.
33483491
(Nat Commun)
PMID
33483491
Date of Publishing: 2021 Jan 22
Title A COVID-19 vaccine candidate using SpyCatcher multimerization of the SARS-CoV-2 spike protein receptor-binding domain induces potent neutralising antibody responses
Author(s) nameTan TK, Rijal P et al.
Journal Nat Commun
Impact factor
11.8
Citation count: 69
Date of Entry 2021 Oct 31


A prefusion-stabilized SARS-CoV-2 spike protein, S-2P was most successful in generating antibodies that neutralised pseudovirus and wild-type live virus when combined with CpG 1018 and aluminium hydroxide adjuvants, with no vaccine-related side effects.
33208827
(Sci Rep)
PMID
33208827
Date of Publishing: 2020 Nov 18
Title Development of CpG-adjuvanted stable prefusion SARS-CoV-2 spike antigen as a subunit vaccine against COVID-19
Author(s) nameKuo TY, Lin MY et al.
Journal Sci Rep
Impact factor
4.12
Citation count: 39
Date of Entry 2021 Oct 31


Nonhuman primates vaccinated with mRNA-1273 developed strong antibody and cell-based immune responses. There was immediate protection in both the upper and lower airways, as well as no pathologic alterations in the lungs. In accordance with the obtained results of mRNA vaccine on non-primates, a clinical study on a small human population is important to know its specific response.
32722908
(N Engl J Med)
PMID
32722908
Date of Publishing: 2020 Oct 15
Title Evaluation of the mRNA-1273 Vaccine against SARS-CoV-2 in Nonhuman Primates
Author(s) nameCorbett KS, Flynn B et al.
Journal N Engl J Med
Impact factor
37.91
Citation count: 460
Date of Entry 2021 Oct 31


Rhesus macaques were immunised with the BBIBP-CorV vaccine at low dose (2ug/dose) and high dose (8ug/dose). exposure to SARS-CoV-2 virus protected the immunised rhesus macaques.
32778225
(Cell)
PMID
32778225
Date of Publishing: 2020 Aug 6
Title Development of an Inactivated Vaccine Candidate, BBIBP-CorV, with Potent Protection against SARS-CoV-2
Author(s) nameWang H, Zhang Y et al.
Journal Cell
Impact factor
27.35
Citation count: 296
Date of Entry 2021 Oct 31


Rhesus macaques were immunised with the BBIBP-CorV vaccine at low dose (2ug/dose) and high dose (8ug/dose). Both the vaccine doses elicited a good neutralising antibody titre and offered protection against intrateacheal SARS-CoV-2 challenge.
32778225
(Cell)
PMID
32778225
Date of Publishing: 2020 Aug 6
Title Development of an Inactivated Vaccine Candidate, BBIBP-CorV, with Potent Protection against SARS-CoV-2
Author(s) nameWang H, Zhang Y et al.
Journal Cell
Impact factor
27.35
Citation count: 296
Date of Entry 2021 Oct 31


The immunogenecity of an inactivated SARS-CoV-2 vaccine candidate (BBIBP-CorV) was tested at three different dosages. At all doses examined, the seroconversion rate reached 100% in mice 7 days after vaccination and 21 days in rabbits, guinea pigs, and rats. When compared to one- and two-dose vaccination regimens, a three-dose vaccination regimen showed better immunogenecity in all animal models studied. Cynomoglus monkeys, rabbit, guinea pigs, rats and mice were immunised with 8, 4 or 2 micro grams of the inactivated BBIBP-CorV.
32778225
(Cell)
PMID
32778225
Date of Publishing: 2020 Aug 6
Title Development of an Inactivated Vaccine Candidate, BBIBP-CorV, with Potent Protection against SARS-CoV-2
Author(s) nameWang H, Zhang Y et al.
Journal Cell
Impact factor
27.35
Citation count: 296
Date of Entry 2021 Oct 31


Rhesus macaques vaccinated with a DNA vaccine, developed a good celluar and humoral immune response. Neutralising anitbody titers in vaccinated animals was comparable to convalescent people. Vaccinated animals challenged with SARS-CoV-2 virus showed a significant reduction (>3.1 and >3.7 log 10 ) in the viral loads in the lungs and nasal mucosa when compared to control animals. 35 Rhesus macaques (6 to 12 years old) were immunized with DNA vaccines in the following groups: S (N = 4), S.dCT (N = 4), S.dTM(N=4),S1(N=4),RBD(N=4),S.dTM, PP (N=5), Sham controls(N=10)
32434945
(Science)
PMID
32434945
Date of Publishing: 2020 Aug 14
Title DNA vaccine protection against SARS-CoV-2 in rhesus macaques
Author(s) nameYu J, Tostanoski LH et al.
Journal Science
Impact factor
20.57
Citation count: 574
Date of Entry 2021 Oct 31


a single dose of the INO-4800 DNA vaccine was able to induce antigen specific T cell responses and neutralising antibodies in mice and guinea pigs.
32433465
(Nat Commun)
PMID
32433465
Date of Publishing: 2020 May 20
Title Immunogenicity of a DNA vaccine candidate for COVID-19
Author(s) nameSmith TRF, Patel A et al.
Journal Nat Commun
Impact factor
11.8
Citation count: 273
Date of Entry 2021 Oct 31