Updated: July 1, 2020 7:22:40 am
A large number of Covid-19 cases are asymptomatic, but researchers have differed on what percentage these constitute of all cases.
Now, a team has studied almost the entire population of a small, quarantined town — Vò in Italy, population 3,200 — and found that 40% of its cases were asymptomatic. The study was published in Nature on Tuesday.
The town of Vò experienced Italy’s first Covid-19 death on February 21. It was put into immediate quarantine for 14 days.
During this time, researchers tested most of the population for Covid-19, both at the start of the lockdown (86% tested) and after two weeks (72% tested).
The testing revealed that at the start of the lockdown, 2.6% of the population (73 people) were positive for Covid-19. After a couple of weeks, only 1.2% (29 people) were positive. At both times, around 40% of the positive cases showed no symptoms (asymptomatic).
The results also show it took on average 9.3 days (range of 8-14 days) for the virus to be cleared from someone’s body.
Source: Imperial College London
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