The UK Government's Chief Scientific Adviser, Sir John Edmunds, declared in an interview published by El País on November 10, 2026, that the most dangerous aspect for societies is what we do not even know that we don't know.
In his statement, Edmunds emphasized that healthcare systems must prepare for crises that are presently impossible to anticipate due to the unexpected and complex nature of new epidemiological threats. He asserted that many diseases or outbreaks cannot be detected with precision before manifesting among large populations, especially when symptoms are vague or emerge within changing social contexts.
The text was originally published on the portal El País, under the section "Planeta Futuro", and directly quotes the British expert during a session on global health risks. No other specific statements or additional dates are reported outside this official source.