Chair Kate Bingham appointed in the UK Vaccine Taskforce on Tuesday said that the first generation of Coronavirus vaccines "is likely to be imperfect" and that they "might not work for everyone".
Bingham wrote in a piece published in The Lancet medical journal, "However, we do not know that we will ever have a vaccine at all. It is important to guard against complacency and over-optimism.”
Bingham wrote that the Vaccine Taskforce acknowledges that "many, and possibly all, of these vaccines, could fail.”
She added the important focus is kept on the vaccines that can raise immune responses in the population that is older than 65 years.
"The first generation of vaccines is likely to be imperfect, and we should be prepared that they might not prevent infection but rather reduce symptoms, and, even then, might not work for everyone or long," she added.
She stated that the global countries lack the capacity and have inadequate resources to manufacture vaccines in abundance, while we need billions of doses.
The United Kingdom's manufacturing capability to date has been "equally scarce", she pointed.
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Earlier on Tuesday, a study by scientists at Imperial College London found that antibodies against the novel coronavirus declined rapidly in the British population during the summer. This finding suggests protection after covid-19 infection may not be long-lasting and it can multiply the prospect of shrinking immunity in the community.
It has been reported that the British government is working on the assumption that the second wave of coronavirus will be more deadly than the first.