China’s vast surveillance system has come to the fore in its attempt to monitor and control the spread of coronavirus.
According to official statistics, the number of newly confirmed cases in China has dropped dramatically – from thousands a day to nearly zero.
Meanwhile, a growing number of countries are also looking at using extensive surveillance systems, such as geolocation tracking to fight the pandemic.
So how exactly can surveillance tools help curb a pandemic and what are the potential pitfalls?
The BBC’s Joe Tidy reports.