Herd immunity for coronavirus is a "myth" in India because at least 80 per cent people need to have antibodies for the whole of the population to be protected, Dr Randeep Guleria told NDTV on Saturday. This, he said, would be difficult if one takes into account the new Indian strains found in Maharashtra -- which could be highly transmissible and dangerous. The new variant, he said, can even cause re-infections in people who have developed anti-bodies to the virus.