World Health Organization officials have said since February that the new coronavirus that causes Covid-19 spreads in most cases via virus-containing droplets emitted when an infected person coughs, sneezes or exhales. These can infect another person by falling into an eye, nose or mouth, or by getting stuck to a hand or finger and transferred there. With new evidence suggesting the virus may linger in the air, the WHO says it is assessing the ongoing research. Here’s an explanation of the estab
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