Notes to global health leaders on 10 and 11 January highlighted possible infection routes
The World Health Organization warned the US and other countries about the risk of human-to-human transmission of Covid-19 as early as 10 January, and urged precautions even though initial Chinese studies at that point had found no clear evidence of that route of infection.
Technical guidance notes seen by the Guardian and briefings by top WHO officials warned of potential human-to-human transmission and made clear that there was a threat of catching the disease through water droplets and contaminated surfaces, based on the experience of earlier coronavirus outbreaks, such as Sars and Mers.
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