If the virus now found in the Americas and Caribbean moves into the bugs» spit
faster than other strains do, it could fuel a larger, faster - moving outbreak in humans — and favor the inside version in the inside / outside hypotheses duel.
Although bacteria have a seemingly limitless capacity to alter their genes by swapping bits of DNA between
strains, this mechanism doesn't seem enough to account for the swift pace of change and the high variability of E. coli and
other strains.Thomas Cebula of the U.S. Food and Drug Administration (FDA) wondered if this rapid evolution is being driven by microbes capable of much
faster -
than - normal variation.