CANBERRA—Australia has purchased an additional million doses of Moderna’s COVID-19 vaccine from the European Union, Prime Minister Scott Morrison said, as the country accelerates its inoculation program. The purchase is a boost for Australia’s AU$2 trillion ($1.5 trillion) economy, which is at risk of slipping into its second recession in as many years as a result of lockdowns of the country’s two most populous cities, Sydney and Melbourne. These lockdowns will remain until 70 percent of the country’s near 26 million population are fully vaccinated, which is not expected until late October. But Morrison said the million doses will arrive later this week. Australia has ordered 25 million vaccines from Moderna. “Some good news today. A family-sized dose of hope for our vaccination program,” Morrison told reporters in Sydney. Australia has recorded 73,610 COVID-19 cases since the pandemic begun. The death toll rose by 7 to 1,091. Australia’s most populous …