The impact of a new Covid vaccine will kick in significantly over summer and life should be back to normal by next winter, one of its creators has said.
Prof Ugur Sahin, co-founder of BioNTech, said this winter would still be hard as the vaccine would not have a big impact on infection numbers.
Last week, BioNTech and co-developers Pfizer said preliminary analysis showed their vaccine could prevent more than 90% of people from getting Covid-19.
About 43,000 people took part in tests.
The UK is expected to get 10 million doses by the end of the year, with a further 30 million doses already ordered. The vaccine is given in two doses, three weeks apart.
Older residents and staff in care homes are likely to be prioritised while the under-50s with no medical problems will be a very low priority.
In an interview on BBC's Andrew Marr Show, Prof Sahin said the "key side effects" seen so far were a mild to moderate pain in the injection site for a few days, while some participants had a mild to moderate fever over a similar period.
"We did not see any other serious side effects which would result in pausing or halting of the study," he added.
After the announcement of the world's first effective vaccine came on Monday, Sir John Bell, regius professor of medicine at Oxford University, suggested life could be back to normal by spring.
"I am probably the first guy to say that, but I will say that with some confidence," he said.
However, Prof Sahin said it would take longer.
If everything continued to go well, he said, the vaccine would begin to be delivered at the "end of this year, beginning of next year".
The goal was to deliver more than 300 million doses worldwide by next April, he said, which "could allow us to only start to make an impact".
He said the bigger impact would happen later, adding: "Summer will help us because the infection rate will go down in the summer and what is absolutely essential is that we get a high vaccination rate until or before autumn/winter next year."
Prof Sahin said it was essential that all immunisation programmes were completed before next autumn.