AstraZeneca vaccine, which is widely available, or to wait for Pfizer later in the year. There are many factors to consider.
One is how well these COVID-19 vaccines work in the “real world" of those getting vaccines now. Real-world data data can tell us how well vaccines protect against currently circulating variants — including the Delta variant, which is dominant in the UK and the subject of lockdowns in Australia.
Though less reliable than clinical trials, real-world data can tell us how well vaccines work in some parts of the population excluded from clinical trials.
They can also tell us whether we can effectively mix vaccines and what the main side-effects are, almost in real time. You might be surprised by the results. Where did