WASHINGTON: America's top infectious diseases official has raised concerns over the safety of Covid-19 vaccines being developed by China and Russia as the world scrambles for answers to a pandemic the WHO warned will be felt for decades. Six months after the World Health Organization declared a global emergency, the novel coronavirus has killed at least 679,000 people and infected at least 17.9 million, according to an AFP tally. As countries across Western Europe announced new lockdowns and reported historic economic slumps, the UN health body said the pandemic was a "once-in-a-century" crisis and its fallout would be felt for decades. Several Chinese companies are at the forefront of the race to develop an immunity to the disease and Russia
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