'A great day for science and humanity': Pfizer says Covid-19 vaccine 90% effective

Pharmaceutical giant Pfizer and biotech firm BioNTech have said their coronavirus vaccine was more than 90% effective in preventing Covid-19 among those without evidence of prior infection.

Pharmaceutical giant Pfizer and biotech firm BioNTech have said their coronavirus vaccine was more than 90% effective in preventing Covid-19 among those without evidence of prior infection.

The results are based on the first interim analysis of Phase 3 of the study, and evaluated 94 confirmed cases of Covid-19 in trial participants.