GENEVA, Switzerland (AFP) — Switzerland on Tuesday authorized booster shots of Covid-19 vaccines for the over-65s, as it urged those with no protection at all to get immunized. The Swissmedic regulatory authority said the booster would be one shot of the Pfizer-BioNTech vaccine, or a half-dose of Moderna. “People at especially high risk can receive a booster dose of a vaccine in order to remain adequately protected against severe episodes of Covid-19,” the agency said. […]