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A study published by the University of Chile earlier this month reported that CoronaVac was 56.5% effective two weeks after the second doses were administered in the country. Crucially, however, they also reported that one dose was only 3% effective. "This would help to explain why Chile with one of the world's most robust vaccine rollouts but 93% of the doses coming from China has experienced a simultaneous significant expansion in cases, and a much slower decline in hospitalizations and deaths compared to the early rollouts in Israel, the United Kingdom and the United States," Ian Bremmer, president of risk consultancy Eurasia Group, said in a research note.