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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Researchers find vaccine roughly as effective against Brazilian variant as it was against other, less contagious versions of virus
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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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Top UN officials say of 128 million doses administered, more than three-quarters are in 10 rich countries, leaving much of the world at risk
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