PARIS, France (AFP) — Vaccination with two doses of the Pfizer jab stays highly effective against severe Covid — including the Delta variant — for at least six months, an analysis of US patients said Monday. While previous data from clinical trials has shown jabs protect against hospitalisation, the study published in the Lancet measures one vaccine’s effectiveness over time in a real-world setting. Pfizer and healthcare provider Kaiser Permanente looked at records from 3.4 […]