I'm in a UK Covid vaccine trial – should I also accept a 'real' jab?

My turn for an AstraZeneca dose has come up, so I need to decide whether to drop out of Novavax tests

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I had two excellent pieces of news this week. They left me feeling utterly wretched.

First, my turn came up for the AstraZeneca vaccine against Covid. I was told I could have my first jab on Thursday.