FILE - In this Oct. 4, 2021 file photo, people traveling in a tube underground train carriage wear face masks to curb the spread of coronavirus on the Bakerloo Line in London. Many scientists are pressing the British government to re-impose social restrictions and speed up booster vaccinations as coronavirus infection rates, already Europe???s highest, rise once more. The U.K. recorded 49,156 new COVID-19 cases on Monday, Oct. 18, 2021, the largest number since mid-July. New infections averaged 43,000 a day over the past week, a 15% increase on the week before. (AP Photo/Matt Dunham, file)