New Zealand Prime Minister Jacinda Ardern has tested positive for COVID-19 and is isolating at home with moderate symptoms. Ardern’s government oversaw one of the world’s most successful campaigns to stamp out the coronavirus — until a wave of Omicron infections earlier this year forced New Zealand to abandon its zero-COVID strategy. More than 80% of New Zealand’s population is fully vaccinated, and the nation’s per capita death rate from COVID is nearly 16 times lower than the U.S.’s.