"According to the Director-General of the WHO, the choice to abandon systematic testing and contract tracing, which were effective in Korea and Taiwan, was a major mistake that contributed to the spread of the virus in virtually every country. The ultimate cause of this alarming delay were strategic choices. [...] Other countries waited far too long to react, largely on the basis of the and crypto-Darwinian strategy of "herd immunity." Boris Johnson's United Kingdom was entirely passive in its initial approach."