Jakarta, the epicenter of the country’s COVID-19 epidemic, kicked off its vaccination drive on Thursday following record daily highs over the past two weeks. Jakarta Health Agency head Widyastuti said at a press briefing on Jan. 14 that the city aimed to vaccinate 7.9 million people to achieve herd immunity. "It's our largest vaccination drive. Our previous mass vaccination program was only designed [to inoculate] 2 million people," said Widyastudi, without indicating the year or the targeted disease of the previous program. Based on the official population of 10.5 million, this works out to 75.2 percent of Jakartans getting the jab. An article published on Johns Hopkins’ COVID-19: School of Public Health Expert Insights states: “Depending how contagious an infection is, usually 50% to 90% of a population needs immunity to achieve herd immuni...