Covid lockdowns in China remain the strategy to deal with outbreaks of cases, whereas the majority of other countries have scrapped most restrictions.
Beijing authorities are trying to stamp out an outbreak with mass testing and avoid a repeat of the city-wide restrictions that have kept Shanghai in lockdown for a month.
Despite the measures, on top of tightly-controlled Chinese social media, videos have emerged of protests against lockdowns, such as in Shanghai.
Meanwhile, long queues outside supermarkets and shops were seen despite government assurances there is sufficient food.
The BBC’s Ros Atkins explains how the country decided on its approach.
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