EU chief Ursula von der Leyen warned Monday that the bloc could block further exports of the coronavirus vaccine, after Italy stopped a shipment to Australia. "That was not a one-off," the president of the European Commission told business weekly Wirtschaftswoche. Rome last week revealed it had blocked the export of 250,700 doses of AstraZeneca's Covid-19 vaccine meant for Australia, blaming the shortage of jabs in virus-hit Europe -- and the lack of urgent need in Australia. hmn/jj