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Developing a safe and effective COVID-19 vaccine is
a global priority to end this pandemic.
In their doseescalation, single-centre, open-label, phase 1 trial
Published in The Lancet, Feng-Cai Zhu and colleagues1
Report the safety, tolerability, and immunogenicity
Of a recombinant adenovirus type-5 (Ad5) vectored
COVID-19 vaccine, which expresses the full length spike
Glycoprotein of the Wuhan-Hu-1 strain of severe acute
Respiratory syndrome corona virus 2 (SARS-CoV-2).
Domain because of better immunogenic and protective
Potential, but using different antigen delivery platforms
(eg, recombinant protein or replicating or non-replicating
viral-vector based vaccines and DNA or mRNA vaccines);
Several are entering phase 1 clinical trials, or pending
results.4, 5 looking forward, other than immunogenicity,
Future trial design to establish efficacy will need to define
The target groups (eg, health-care workers, individuals at
High risk of severe illness), clinical endpoints (eg, reduction
In virologically confirmed clinical illness, hospitalizations,
Deaths), optimal duration of observation (eg, virus
Exposure, side-effects, antibody titre change), and to
Anticipate antigenic change over time.
Results of this study indicate that some host
Factors might affect vaccine response.
Suboptimal
immunogenicity was reported among older participants,
echoing the challenge seen with influenza vaccination.
Further study in the older age group and the inclusion of
individuals with underlying conditions are important, as
they are at risk of severe disease and might benefit most
from vaccine prevention.
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