Two years of covid-19: What we’ve learned during the pandemic so far

By Helen Thomson

On 31 December 2019, Chinese authorities informed the World Health Organization (WHO) about a cluster of “viral pneumonia” cases of unknown cause in the city of Wuhan. Two years later, the coronavirus now known as SARS‑CoV-2 has resulted in at least 5.3 million deaths. As the world awaits the full impact of the new variant omicron, New Scientist looks back at the phenomenal scientific endeavour across the pandemic, and at how much we now know about the …

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