The UK is likely to be among the European countries worst affected by coronavirus, one of the government's senior scientific advisers has said. The warning, from Sir Jeremy Farrar, comes as UK deaths from the virus are expected to pass 10,000 on Sunday. In response, Business Secretary Alok Sharma said countries were on "different trajectories". On Saturday, the UK recorded 917 new coronavirus deaths, taking the total number of hospital deaths to 9,875. The figure does not include deaths outside of hospitals, such as in care homes or in the community. Ministers are continuing to urge people to stay at home over the Easter weekend to curb the spread of the virus, despite warm and sunny weather across parts of the UK. Earlier the prime minister said he owed his life to the NHS staff treating him for coronavirus. Boris Johnson remains in hospital, where he continues to recover after spending three nights in intensive care. Wellcome Trust director Sir Jeremy Farrar told the BBC's Andrew Marr Show the UK was likely to be "one of the worst, if not the worst affected country in Europe". Currently Italy has the highest number of deaths of any European country - with more than 19,000 deaths - followed by Spain, France and the UK, according to data compiled by Johns Hopkins University. Germany has kept deaths below 3,000 so far. Sir Jeremy, a member of the government's Scientific Advisory Group for Emergencies (Sage), told the BBC's Andrew Marr Show the "remarkable" scale of testing in Germany had been key to keeping the number of hospital admissions for coronavirus lower than in the UK. Sir Jeremy said testing allowed countries to isolate people with Covid-19, preventing them from transmitting the virus to others, as well as buying time for hospitals to prepare. "Undoubtedly there are lessons to learn from that," he added. The UK government has said it wants to do 100,000 coronavirus tests a day by the end of April but has faced criticism for not increasing the number more quickly. Sir Jeremy said a second or third wave of the virus "was probably inevitable" and treatment and a vaccine was "our only true exit strategy". He said a vaccine could be available by autumn but it would take longer to ramp up manufacturing to the scale required to vaccinate many millions of people. "I would hope we would get [that] done in 12 months but that is in itself an unprecedented ambition," he said.