ROME (AP) — The number of confirmed coronavirus cases worldwide topped 20 million, more than half of them from the United States, India and Brazil, as Russia on Tuesday became the first country to approve a vaccine against the virus.
DUBAI (Reuters) - Saudi Arabia will soon begin Phase III clinical trials on around 5,000 people for a COVID-19 vaccine developed by China’s CanSino Biologics Inc, a Saudi health ministry spokesman said on Sunday.
For a spiky sphere just 120 nanometers wide, the coronavirus can be a remarkably cosmopolitan traveler.
Spewed from the nose or mouth, it can rocket across a room and splatter onto surfaces; it can waft into poorly ventilated spaces and linger in the air for hours. At its most intrepid, the virus can spread from a single individual to dozens of others, perhaps even a hundred or more at once, proliferating through packed crowds in what is called a superspreading event.
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