“In our country, if you come from Great Britain, you have to go into quarantine,” said Merkel, who was making what was likely her last speech to Germany’s parliament. “That’s not the case in every European country, and that’s what I would like to see.” The warnings from the two leaders, which come as cases climb again in Britain and as Europe opens up to some foreign tourists, were underlined by a new report from the European Center for Disease Prevention and Control. The ECDC said in the report that the delta variant would be responsible for 90 percent of coronavirus infections in the European Union and the European Economic Area — which also includes Iceland, Liechtenstein and Norway — by the end of August. Any relaxation of covid protocols “could lead to a fast and significant increase in daily cases in all age groups” and a reprise of last year’s fall surge, the agency said.