Intended for healthcare professionals


Antibiotics in farm animals . . . and other stories

BMJ 2019; 367 doi: (Published 10 October 2019) Cite this as: BMJ 2019;367:l5821

Antimicrobial resistance in animals

Worldwide, nearly three quarters of all antimicrobial drugs sold are used in animal food production—a fact that gets surprisingly little attention when antimicrobial resistance is being discussed. The four types of antibiotic commonly used to promote weight gain in farm animals—tetracyclines, sulphonamides, quinolones, and penicillins—are those with highest resistance rates. Between 2000 and 2018, the proportion of these drugs to which bacteria have become resistant tripled in chickens and pigs, and doubled in cattle (Science doi:10.1126/science.aaw1944).

Ageing of the brain

Using magnetic resonance images from 35 000 healthy people, investigators trained a machine learning algorithm to estimate the chronological age of the brain …

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