Optimising SARS-CoV-2 vaccination schedules

Article Medicine, General & Internal

Single-dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials

Merryn Voysey et al.

Summary: The AZD1222 vaccine has been approved for emergency use in the UK with an interval of 4-12 weeks between doses. Analysis shows that the vaccine is efficacious with two doses and provides immunoprotection after the first dose before the second dose is administered.

LANCET (2021)

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Review Immunology

Optimize Prime/Boost Vaccine Strategies: Trained Immunity as a New Player in the Game

Jean-Louis Palgen et al.

Summary: Optimizing vaccination strategies involves understanding how vaccine history affects memory B and T cell characteristics. Innate cells, particularly myeloid lineage cells, respond differently to first and second vaccine doses, affecting innate immune responses. Trained innate cells have the potential to improve vaccination strategies by enhancing antigen uptake, presentation, migration, and cytokine production.

FRONTIERS IN IMMUNOLOGY (2021)

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Article Medicine, General & Internal

Heterologous prime-boost COVID-19 vaccination: initial reactogenicity data

Robert H Shaw et al.

LANCET (2021)

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Article Medicine, General & Internal

Safety and immunogenicity of heterologous versus homologous prime-boost schedules with an adenoviral vectored and mRNA COVID-19 vaccine (Com-COV): a single-blind, randomised, non-inferiority trial

Xinxue Liu et al.

Summary: Heterologous prime-boost COVID-19 vaccine schedules could facilitate mass immunisation, with ChAd/BNT showing non-inferior immunogenicity compared to ChAd/ChAd, but BNT/ChAd did not demonstrate non-inferiority to BNT/BNT. The results support flexibility in using heterologous prime-boost vaccination with ChAd and BNT COVID-19 vaccines.

LANCET (2021)

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Article Medicine, General & Internal

Immunogenicity and reactogenicity of BNT162b2 booster in ChAdOx1-S-primed participants (CombiVacS): a multicentre, open-label, randomised, controlled, phase 2 trial

Alberto M. Borobia et al.

Summary: To date, there are no immunological data on COVID-19 heterologous vaccination schedules in humans. This study evaluated the immunogenicity and reactogenicity of administering BNT162b2 as a second dose in individuals primed with ChAdOx1-S. The results showed that BNT162b2 induced a robust immune response in individuals prime vaccinated with ChAdOx1-S, with an acceptable and manageable reactogenicity profile.

LANCET (2021)

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Article Medicine, General & Internal