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The pandemic has reached a grim milestone: one million people have now died of COVID-19, according to Worldometers.

On January 13, we published “Mystery China pneumonia outbreak likely caused by new human coronavirus” by Connor Bamford, a virologist at Queen’s University Belfast. Since then, we have published more than 3,500 articles on the now not-so-novel coronavirus, officially named Sars-CoV-2. Despite this huge output from the world’s leading experts, we have merely skimmed the surface of all there is to know about this perplexing pathogen. So much remains a mystery.

At this important juncture, we asked several experts from different fields what their burning question about the coronavirus is.

Read the full article on The Conversation website, contributed to by Professor David Hunter (Nuffield Department of Population Health)

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