In an analysis published in theLancet, researchers from the Kirby Institute,the Doherty Institute and the University of Sydney found that a third,booster jab within a year more than doubled levels of immunity than that seen after the first two doses.
The research also showed that boosters work at improving immunity against current variants,including Delta.
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Co-author on the paper Professor Jamie Triccas,from the University of Sydney,said the research showed a booster dose was very effective,“but it is very unlikely a third dose will protect us for life”.
A senior research fellow at the Kirby Institute and another co-author on the paper,Dr Deborah Cromer,said boosters would be essential in the fight against COVID-19.
“A major implication of our research is that to keep up immune protection booster shots are needed,” she said. “Reassuringly though,protection against severe disease and death will likely remain high beyond the first year.
“We don’t know what variants will emerge in the next couple of years,and what vaccines will be needed. The virus has continued to surprise us. But without boosters,protection from symptomatic COVID-19 could drop below 50 per cent after six months,which means more people will become infected.”