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RIO DE JANEIRO, BRAZIL - Scientists from several countries are racing to find a vaccine or drug to fight the novel coronavirus, which has already caused almost 340,000 deaths worldwide. As time moves on, good news on progress starts coming in. Last week, several research studies on vaccines or drugs for Covid-19 have reported significant developments.

One of these, from Oxford University, is recruiting 10,000 volunteers for human trials, including children and the elderly. Another initiative in China has had promising results reported in a study published in the renowned scientific journal The Lancet. The vaccine was tested . . .

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