Covid-19 patients most infectious before symptoms even appear, study finds

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CORONAVIRUS | Covid-19 patients may be most infectious before symptoms first appear, according to a study published in the scientific journal Nature Medicine yesterday. The study’s authors estimated that pre-symptomatic infections account for 44 percent of the Covid-19 infections they had analysed, but said the figure will vary in different locations depending on how quickly local authorities can detect and isolate patients. Figures as high as 48 percent and 62 percent have been reported by other researchers in Tianjin and Singapore, they noted, where local authorities have implemented active case finding. Due to the high proportion of pre-symptomatic transmission, the researchers said measures to control the spread of Covid-19 that only kick-in after symptoms appear would probably have a reduced impact. This includes measures such as isolation, contact tracing, and requiring peop…