Which country had the most confirmed COVID-19 cases and has most of its population vaccinated?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q92743', 'id': 1, 'label': 'Vint Cerf'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q84263196', 'id': 2, 'label': 'COVID-19'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P27', 'source': 1, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P1050', 'source': 1, 'target': 2, 'label': 'medical condition'}]}