Pfizer Covid jab ‘90% effective against hospitalisation for at least 6 months’

Study shows protection against severe illness stays high, but scientists say boosters key to stopping spread of infection

Two doses of the Pfizer/BioNTech Covid vaccine are highly effective" at preventing hospitalisations for at least six months, a large-scale study shows, but protection against infection nearly halves over the same period.

Effectiveness against all Covid infections fell from 88% within a month of having two doses to 47% after six months, according to the research. However, effectiveness against hospitalisations remained high at 90% overall - and crucially across all variants, including delta.