Prime Minister Scott Morrison has announced that most Australians under 50 are now advised to get the Pfizer vaccine over the jab by AstraZeneca, based on a "potentially increased risk" of extremely rare blood clots among younger people. Subscribe: Get more breaking news at:

0:00 All you need to know
2:23 How will this overhaul impact the rollout?
4:07 Infectious diseases expert explains

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