Single Covid-19 vaccine dose or double? Data put regulators in a fix

The US Food and Drug Administration has released its findings on the Pfizer/BioNtech efficacy data where it suggested that the vaccine at a single dose with 67% efficacy would work. Pfizer has said its vaccine efficacy is 97% when two doses are given at an interval of 30 days.
Source: The Economic Times Healthcare and Biotech News - Category: Pharmaceuticals Source Type: news