Vaccination reduces the risk of dying or being hospitalised with Covid-19 by 90%, a French study of 22.6 million people over the age of 50 has found. The research published on Monday also found that vaccines appear to protect against the worst effects of the most prevalent virus strain, the Delta variant. “This means that those who are vaccinated are nine times less at risk of being hospitalised or dying from Covid-19 than those who have not been vaccinated,” the epidemiologist Mahmoud Zureik, who oversaw the research, told Agence France-Presse. The study – the largest of its kind so far...