i wonder which vaccine is most effective at stopping the spread of the virus. it is a shame that contact tracing has not yet been able to answer this for us. we’d be a lot better off if at least a sample of trial participants / control were contact traced. that would reveal much
yes, it presents a huge issue, but if any of the data is collected on e.g. whether the closest contacts of those vaccinated later catch the disease, it may still be possible to tease indications out of it.
