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Leader and Health

Covid-19’s many unknowns are what make it so tricky to beat

6 January 2021

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Chong Voon Chung/Xinhua/Cover Images

IN THE UK, back in July, covid-19 cases had dropped so much that politicians spurred people to dine out to boost the economy. Citizens were told that restrictions on daily life would be over “in time for Christmas”. That didn’t happen.

Instead, as the northern summer ended, infections climbed, and kept on climbing despite complicated systems of protection levels and tiers, as did the number of people in hospitals. With hospitalisations now perilously high, nearly all parts of the UK are back under strict lockdown conditions.

Of course, the UK isn’t the only nation struggling with second or even third…

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