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Future pandemics could be even more lethal than Covid-19 so the lessons learned from the outbreak must not be squandered and the world must ensure it is prepared for the next viral onslaught, one of the creators of the Oxford-AstraZeneca vaccine said. "The truth is, the next one could be worse. It could be more contagious, or more lethal, or both," Prof Dame Sarah Gilbert said in the Richard Dimbleby Lecture, the BBC reported. "This will not be the last time a virus threatens our lives and our livelihoods." Gilbert, a professor of vaccinology at the University of Oxford, said the world should make sure it is better prepared for the next virus. "The advances we have made, and the knowledge we have gained, must not be lost," she said. Efforts to end the Covid-19 pandemic have been uneven and fragmented, marked by limited access to vaccines in low-income countries while the "healthy and wealthy" in rich countries get boosters, health experts say.