RIO DE JANEIRO, BRAZIL - Currently, there are no approved treatments or vaccines for Covid-19, a disease caused by the novel coronavirus that has killed over 440,000 people worldwide. In Brazil there are now over 45,000 victims.

However, up to the start of June, there were 153 drugs and vaccines being tested in 1,765 trials with patients who contracted Covid-19. But the majority of these drugs are still in their early stages of research. Among the most advanced studies are the antimalarial chloroquine and hydroxychloroquine, although results are not very encouraging. The drugs have been shown . . .

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