COVID-19 herd immunity will take time, says WHO's Soumya Swaminathan
India | July 24, 2020 18:59 ISTThe chief scientist of the WHO, Dr Soumya Swaminathan, on Friday warned that the concept of “herd immunity”, or a large section of the population developing antibodies against COVID-19, is still a long way off and can be sped up by a vaccine.