Wuhan businesswoman Duan Ling and her surgeon husband Fang Yushun began to hear snippets in hospital chat groups about a disease emerging in the city's respiratory wards.Duan didn't pay much attention at first.Fang had that year returned from a stint studying in the United States, and the pair, both 36-years-old, were planning a family, starting a costly round of fertility treatments."But as more and more news came, we began to realise this was something different from previous infectious diseases," said Duan.In just over a month, Fang would become one of the first people in the world to contract what came to be known as COVID-19, which has since infected over 74 million worldwide and killed more than 1.5 million.During the early days of.