What's it like advising government on the maths behind COVID-19? Find out with epidemiologist Julia Gog in this new podcast series.

Modelling shows that your choice of how many households you bubble with this Christmas can make a real difference to the spread COVID-19.

Are they safe? Are they effective? Will they stop the pandemic? Find out with our FAQ informed by experts.

We can't say for sure, but everything depends on how many people agree to be vaccinated.

Modelling shows that old and vulnerable people should be prioritised.

Like any medical drug, vaccines are tested in large-scale randomised controlled trials.

The efficacy of vaccines is estimated from trials, using statistical techniques.

Because the vaccine may not stop transmission of the virus.

Yes the approved vaccines are safe. If you balance the risks, then taking the vaccine is much safer than taking your chances with COVID-19.

We are all longing to go into a lower tier, but this can come at a high price later on.