Why is this happening?
For one thing, bacteria breed in millions of colonies, and are constantly mutating and exchanging genetic material. New strains come about all the time, breeding in the guts of animals, and by Darwinian principles, the fittest survive. E coli live in the intestines of animals – including cows. By feeding cows grain instead of the grass they are intended to eat, we make their guts more acidic, making it easier for this type of bacteria to thrive. From cow intestines, the bacteria makes its way into manure and on out into our crops and our ground water, where it spreads easily to humans.
