Covid infections fell by 65% after first dose of AstraZeneca, in UK study

People who have been vaccinated with a single dose of either the Oxford-AstraZeneca or Pfizer-BioNTech vaccines were 65% less likely to get a new Covid infection, a UK study has found. The chances of becoming infected by COVID (SARS-CoV-2) fell sharply after a first dose. However, some people can still get Covid after being vaccinated but the ongoing transmission is reduced.