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In reply to the discussion: Well, humans, we had a good run: "invincible" bacteria found in the wild [View all]magical thyme
(14,881 posts)and are surprised, shocked and horrified that the bacteria resident in the pigs developed immunity to the drug.
This has been known for a long, long time. That this time the factory "farmers" chose to use a drug from the 'last resort' class of drugs shows stupidity of incredible levels.
Bacteria evolve in realtime. Bacteria DNA doesn't have the "proofreader/editor" capabilities of "higher" animals. Therefore, random mutations occur with much greater frequency. That increases the odds of a random mutation that confers a competitive advantage appearing and subsequently getting a toehold.
It is unfortunate that in this particular case, the gene in question seems to get passed around quite easily. Apparently it has been found in both e. coli and k. pneumoniae.
DON'T BUY PIG MEAT OF ANY TYPE FROM CHINA. And if you do break down, wash your hands/countertops/utensils/etc and cook it thoroughly.