BRUSSELS: As a renewed wave of the coronavirus sweeps across much of Europe, the reality of the disease struck a summit of European Union leaders on Thursday when one of the 27-nation bloc's top officials abandoned the meeting to go into self-imposed quarantine.European Commission President Ursula von der Leyen left the summit venue in Brussels shortly after the meeting began because one of her close staffers tested positive for COVID-19.“I myself have tested negative," von der Leyen, a doctor by training, tweeted. “However, as a precaution I am immediately leaving the European Council to go into self-isolation."In its latest update on Thursday, the European Centre for Disease Prevention and Control said that more than 4.4 million cases of.