Chilean health authorities announced a blanket lockdown across the capital Santiago on Thursday following some of the worst COVID-19 case numbers since the pandemic began, despite having fully vaccinated more than half its population. The development, which will alarm authorities elsewhere who are debating how fast to reopen as vaccination campaigns gather steam, comes as Chile's confirmed daily caseload surged 17% in the past two weeks nationwide and 25% in the Metropolitan region that includes Santiago and is home to half the country's population... Chile has one of the world's highest vaccination rates. Around 75% of its 15 million target population have already received at least one dose of vaccine, and nearly 58% are completely inoculated. On a per capita basis among larger countries, it the vaccination leader in the Americas and the fifth highest worldwide, according to Reuters data. It has used nearly 23 million vaccines doses so far - 17.2 million of Sinovac's, 4.6 million of Pfizer /BioNTech's, and less than 1 million each of AstraZeneca's< AZN.L> and CanSino's.