Now for the big Covid-19 test: how well do vaccines work in the real world? | South China Morning Post

The coronavirus pandemic is entering a critical phase as the most transmissible variant yet hits dozens of countries, driving new surges and making vaccination more urgent. Now the key question is how well the vaccines work. A handful of vaccines have passed the World Health Organization's requirements for more than 50 per cent efficacy and to reduce severe disease and hospitalisation. But scientists are watching to see how well vaccines work in the real world, including how well they reduce the scale and severity of outbreaks in countries with high rates of vaccination. Jerome Kim, director general of the International…