Yet time and again humanity's supremacy was threatened by deadly hidden microorganisms: blood-sucking parasites in paddy fields, dysentery caused by water polluted with excrement, and epidemics caused by the cohabitation of people and domestic animals.
不過，人類的霸主地位，還是不時遭受到處處暗藏的微生物殺手的威脅：不論是水田裡的血吸蟲、藉糞便污水傳染的痢疾，甚至於人畜家禽雜處而引發的各種共通疫疾等，都曾對人類社群造成重大傷害。