World Health Organisation (WHO) chief Tedros Adhanom Ghebreyesus has said that the top health organisation has no guarantee whether any single Covid-19 vaccine now in development will work addressing a virtual press conference. He said: “We have no guarantee that any single vaccine now in development will work.”“The more candidates we test, the higher the chance we will have of a safe and efficacious vaccine,” he added. According to the WHO, almost 200 vaccines for Covid-19 are currently in clinical and pre-clinical testing.“The history of vaccine development tells us that some will fail, and some will succeed,” Ghebreyesus said.“The fastest route to ending the pandemic and accelerating the global economic recovery is to ensure some people are vaccinated in all countries, not all people in some countries,” he noted.
