Colistin is known as the "antibiotic of last resort," and is given to humans who are extremely ill. India has been using hundreds of tons of colistin to make healthy meat animals like chickens grow more quickly.
From The Guardian:
A study by the Bureau of Investigative Journalism has found that hundreds of tonnes of colistin, described as an antibiotic of last resort, have been shipped to India for the routine treatment of animals, chiefly chickens, on farms.
The finding is concerning because the use of such powerful drugs can lead to an increasing resistance among farm animals around the world. Colistin is regarded as one of the last lines of defence against serious diseases, including pneumonia, which cannot be treated by other medicines. Without these drugs, diseases that were commonly treatable in the last century will become deadly once again.
There is nothing to prevent Indian farmers, which include some of the world's biggest food producers, from exporting their chickens and other related products overseas. There are currently no regulations that would prevent such export to the UK on hygiene terms, except for those agreed under the EU. Any regulations to be negotiated after Brexit might not take account of these regulations.
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