"Human challenge" trials of potential COVID-19 vaccines, where volunteers are deliberately infected with the disease, could become a reality in Britain.
Thai Prime Minister Prayuth Chan-ocha said on Friday he was not quitting after tens of thousands of anti-government protesters defied a ban on demonstrations and he warned them not to persist.
President Donald Trump and Democratic challenger Joe Biden will return to the campaign trail on Friday, a day after the two contenders clashed from afar during duelling televised town halls.
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