US health agency revises risk alerts for over 120 countries and territories, with 61 moved from very high to high risk of contracting COVID-19
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Close relatives of the virus causing the pandemic have cropped up in Thailand and Cambodia, raising the odds of an origin outside of China
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South Africa, India have led an effort at World Trade Organization to waive drug companies' exclusive rights to manufacture their vaccines during the pandemic
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Food and Drug Administration says drugmakers do not have to conduct large-scale clinical trials for vaccines adapted to fight new coronavirus variants////
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Up to 90 healthy volunteers will be deliberately infected with virus with goal of developing more effective vaccines and treatments
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World Health Organization said UN-led COVAX initiative aims to start shipping about 90 million doses of COVID-19 vaccines to Africa this month
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