At the peak of Israel’s Covid vaccination drive, the halls of a huge basketball arena in Jerusalem were filled with people, each anxiously waiting up to two hours until their number was called. More than 3,000 people a day were being vaccinated here in January. On Monday, no more than 15 people lingered around long rows of empty chairs. Some barely had time to sit down before they were called to receive a jab. “They wait about 10 seconds,” said...