Covid-19 may have been circulating in China as early as August 2019, a new study from Harvard Medical School claims.
Travellers line up with their belongings outside Hankou Railway Station after travel restrictions to leave Wuhan, the capital of Hubei province and China's epicentre of the novel coronavirus disease outbreak, were lifted, April 8, 2020.Covid-19 may have been circulating in China as early as August 2019, a new study from Harvard Medical School claims.
However, an analysis of hospital traffic and search engine data in Wuhan indicates that there was early disease activity in the fall of 2019, according to HMS researchers.published on Monday on Harvard University's DASH server, analysts used satellite images of parking lots at six hospitals in Wuhan to calculate vehicle counts and estimate hospital occupancy trends. The vehicle numbers were compared to trends seen during other flu-like illness outbreaks.
It found that between 2018 and 2020 there was a general upward trend in hospital occupancy — but there was a steep increase in occupancies from August 2019, which culminated with a peak in December 2019.
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