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Even an effective coronavirus vaccine will not return life to normal in spring, a group of leading scientists has warned.
A vaccine is often seen as the holy grail that will end the pandemic.
But a report, from researchers brought together by the Royal Society, said we needed to be "realistic" about what a vaccine could achieve and when.
They said restrictions may need to be "gradually relaxed" as it could take up to a year to roll the vaccine out.
More than 200 vaccines to protect against the virus are being developed by scientists around the world in a process that is taking place at unprecedented speed.

Elon Musk unveils brain chip implant: 'It's like a Fitbit in your skull'
The coin-sized device could help a paralyzed person operate technology.
Tech mogul Elon Musk unveiled his latest foray into science fiction Friday night: a brain chip implant to allow people who are paralyzed to operate technology, such as smartphones or robotic limbs, with their thoughts.
"I think it's going to blow your minds," Musk said. "It's like a Fitbit in your skull with tiny wires."
But the coin-sized chips, developed by Musk's secretive startup Neuralink, are a ways off from being useful to humans. Friday's livestreamed YouTube demonstration was on a pig named Gertrude, who Musk said had a brain chip implanted two months earlier.

As the pig shuffled around its pen sniffing hay, a computer beeped and blue wavelengths on the screen jumped up and down. Musk said the computer was measuring Gertrude's brain activity. "The beeps you are hearing are real-time signals," he said. "The future's going to be weird."

But the "move fast and break things" ethos that defines Silicon Valley has not always been kind to inventors who try their luck in bio technology. Medical innovation is notoriously slow. Conducting clinical trials to prove the safety and efficacy of medical devices can take years.

More than 25 million people have been infected with Covid-19 since the pandemic began and 842,000 have died, according to Johns Hopkins University's global tally.
A CDC forecast projects more than 200,000 coronavirus deaths in the United States by Sept. 19, as the country approaches 6 million confirmed coronavirus cases.
At least 36 states have reported positive cases at colleges and universities as a new school year starts, with the University of Alabama alone recording 1,200 cases.
India reported 78,761 new cases in 24 hours and has now recorded 3,542,733 cases in total — behind only the US and Brazil.