In Wuhan, nearly half a million people may have had Covid-19, study shows. That's almost 10 times the official figure - CNN

https://www.cnn.com/2020/12/29/asia/china-coronavirus-seroprevalence-study-intl-hnk/index.html?utm_medium=social&utm_term=image&utm_source=twCNN&utm_content=2020-12-29T09%3A30%3A05