Which country had the most confirmed COVID-19 cases and has most of its population vaccinated?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q84263196', 'id': 0, 'label': 'COVID-19'}, {'type': 'INTERNAL', 'name_': 'Q8277', 'id': 1, 'label': 'multiple sclerosis'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q2858961', 'id': 2, 'label': 'apremilast'}, {'type': 'INTERNAL', 'name_': 'Q179945', 'id': 3, 'label': 'psoriasis'}, {'type': 'INTERNAL', 'name_': 'Q6276882', 'id': 4, 'label': 'Jordan Peterson'}, {'type': 'INTERNAL', 'name_': 'Q95275864', 'id': 5, 'label': 'COVID-19 pandemic: the experience of a multiple sclerosis centre in Chile'}], 'links': [{'name_': 'P2176', 'source': 1, 'target': 2, 'label': 'drug or therapy used for treatment'}, {'name_': 'P2176', 'source': 3, 'target': 2, 'label': 'drug or therapy used for treatment'}, {'name_': 'P1050', 'source': 4, 'target': 0, 'label': 'medical condition'}, {'name_': 'P1050', 'source': 4, 'target': 3, 'label': 'medical condition'}, {'name_': 'P921', 'source': 5, 'target': 0, 'label': 'main subject'}, {'name_': 'P921', 'source': 5, 'target': 1, 'label': 'main subject'}]}