World Health Organization says Covid-19 herd immunity will not happen in 2021

Soumya Swaminathan, World Health Organization (WHO) chief scientist, said Monday that despite the growing availability of vaccines herd immunity to the Covid-19 would not be achieved in 2021. . Until then, preventive measures such as masks will be necessary.
Swaminathan commended the "incredible progress" made by researchers to develop several safe and effective vaccines at unprecedented speed.
"We won't get back to normal quickly," Dale Fisher, chairman of the WHO's Outbreak Alert and Response Network, told a conference hosted by the Reuters news agency.