What can we expect from a disease for which natural or vaccine induced immunity wanes?
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.