A concept and approach currently popular in the UK and The Netherlands, to combat the coronavirus pandemic. According to this mechanism of combating infectious diseases, authorities should let the deadly coronavirus spread so a large proportion of the community is immune to the virus. According to the specialists (Raina MacIntyre, head of the biosecurity program at the UNSW's Kirby Institute), to achieve herd immunity, meaning enough people become immune to a virus through exposure that its spread is thwarted, requires between 55 and 60 per cent of a population to be infected. These days, both countries declared national lockdowns and more measures to prevent the spread of the virus.