The World Health Organization (WHO) expects a large-scale supply of coronavirus vaccines to begin by mid-2021, TASS reported referring to the chief researcher of the WHO Soumya Swaminathan.

A large number of clinical trials are underway globally, she said.

According to her, they see a large pool of candidate vaccines and know that vaccine development has a success rate of around 10%. Therefore, there are high hopes that several of them will prove their effectiveness and safety.