US says unlikely to use China, Russia virus vaccine as race heats up

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.

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