The Morrison government is aiming to have all Australians inoculated with at least one dose of coronavirus vaccine by the end of the year. But Trade Minister Dan Tehan says the world is still under the cloud of a pandemic and things can quickly change. Last week, the government’s vaccine program suffered a major set-back after health authorities recommended the AstraZeneca vaccine should only be given to people above 50 due to the risk of blood clotting. It was the vaccine the government was relying heavily on, but it has since secured an additional 20 million Pfizer vaccine doses that will be shipped from abroad later in the year. “That is definitely the aim, that is the goal we have set trying to have all Australians have a dose by the end of the year,” Tehan told Sky News’ Sunday Agenda program. Prime Minister Scott Morrison had originally been working …