Pfizer protection halves in six months but still keeps you out of hospital
Findings underline the need for more research into booster shots, say researchers
Two doses of the Pfizer vaccine are 90% effective against Covid-19 hospitalisation for all variants — including Delta — for at least six months.
A new study by Kaiser Permanente and Pfizer, published in medical journal The Lancet this week, has confirmed this.
But researchers found effectiveness against all SARS-CoV-2 infections declined over the study period, falling from 88% within one month after receiving two vaccine doses to 47% after six months...