Vaccines don’t provide protection for as long as hoped, study reveals
Data from test results show the effectiveness of some vaccines begins to wane after four to five months
Protection against Covid-19 offered by two doses of the Pfizer/BioNTech and Oxford/AstraZeneca coronavirus vaccines begins to fade within six months, underscoring the need for booster shots, according to researchers in Britain.
After five to six months, the effectiveness of the Pfizer jab at preventing infection in the month after the second dose fell from 88% to 74%, an analysis of data collected in Britain’s ZOE Covid study showed.
For the AstraZeneca vaccine, effectiveness fell from 77% to 67% after four to five months...