此后又发现了两个变种，而令这些细菌拥有抗生素耐药性的基因可以在物种间跃迁 — — 即所谓的“流动性遗传要素 ” — —目前已经在全世界的农场和医院中发现。
Since then, two more variants of the bacterium have been discovered, and the genes that enable these bacteria to resist antibiotics and jump between species – so-called “mobile genetic elements” – have been found on farms and in hospitals around the world.