A World Health Organization (WHO) special COVID-19 envoy predicted a third wave of the pandemic in Europe in early 2021 if governments repeat what he said was a failure to do what was needed to prevent the second wave of infections. "They missed building up the necessary infrastructure during the summer months after they brought the first wave under the control," the WHO's David Nabarro said in an interview with Swiss newspapers. "Now we have the second wave. If they don't build the necessary infrastructure, we'll have a third wave early next year," said Nabarro, a Briton who campaigned unsuccessfully…