细菌的两种突变需要我们特别注意：以敌对形态发生，使他们具备超强抗药性的适应性突变；或是在“安全”的细菌群落中的致命性变种。
Bacteria should be checked for two types of mutation: adaptation by a hostile form that enables it to become super-immune to drugs, or a deadly mutant strain that appears in one of the multitude of “safe” bacteria.