Here's everything you need to know about the potential Oxford University Covid vaccine

The vaccine is designed to mimic the coronavirus and train the immune system to react if a person is later infected

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The vaccine developed and tested by a team at Oxford University is one of the most promising of the many candidates being developed around the world to protect against Covid-19. Australia has now signed a letter of intent with pharmaceutical company AstraZeneca to supply Australians with the vaccine if it clears safety and effectiveness trials, with the prime minister now saying it won't be compulsory but will be encouraged.

Here's what you need to know about the vaccine.