PHE data show up to 50% reduction in transmission of COVID from first vaccine. 3 implications:

1) Getting a vaccine helps protect others

2) This is likely to be improved by getting your second dose

3) If people you meet are vaccinated it reduces your risk- but not completely. https://t.co/5ost4UcjhS

— Professor Chris Whitty (@CMO_England) April 28, 2021