Single dose of Pfizer vaccine cuts Covid-19 spread by half: Study

Protection against coronavirus seen from about 14 days after vaccination

A single dose of either the Oxford/ AstraZeneca or Pfizer/BioNTech vaccines have been found to cut Covid-19 transmission rates by up to half, according to a new Public Health England (PHE) study on Wednesday.
 
Those given a first dose of either of the two vaccines currently being administered by the National Health Service (NHS) and who became infected with SARS-Cov-2 — the coronavirus which causes Covid-19 — three weeks later were between 38 and 49 per cent less likely to pass the virus on than unvaccinated people.
 
The PHE also found that protection against Covid-19 was seen from