No guarantee that COVID-19 vaccine can be successfully developed: WHO Envoy

Humanity will have to live with the threat of coronavirus "for the foreseeable future" and adapt accordingly because there is no guarantee that a vaccine can be successfully developed, WHO Special Envoy David Nabarro has said. "Some viruses are very, very difficult when it comes to vaccine development," he added. "Older people will have to be protected," Nabarro further said.