Imagine pouring a glass of raw milk, only to discover it’s teeming with antibiotic-resistant bacteria—a silent threat lurking in a staple many rely on daily. This is the alarming reality uncovered by a groundbreaking study, led by Tahir Usman of Abdul Wali Khan University Mardan, Pakistan, and published in PLOS One (https://plos.io/47Jd3yP). But here’s where it gets controversial: in Pakistan, over 95% of milk is consumed raw, meaning it hasn’t been pasteurized to eliminate harmful bacteria. This practice, while traditional, opens the door to contamination from sources like improper handling or subclinical mastitis—a sneaky infection in the animal’s teat that often goes unnoticed. And this is the part most people miss: the overuse of antibiotics to treat these infections has birthed multidrug-resistant bacteria, which can leap from animals to humans through raw milk.
The study zeroed in on Staphylococcus epidermidis, a bacterium that causes subclinical mastitis without showing obvious symptoms in cows or sheep. Researchers collected 310 milk samples—half from cattle, half from ewes—and tested them for this hidden menace. The results? Nearly 13% of samples were contaminated with S. epidermidis, and a staggering 95% of these bacteria were resistant to penicillin and erythromycin. Worse, half were resistant to three or more antibiotics. Here’s the kicker: while S. epidermidis is usually harmless on human skin, its multidrug-resistant variants in raw milk could transfer resistance genes to more dangerous pathogens, like MRSA-causing Staphylococcus aureus.
This isn’t just an animal health issue—it’s a ticking time bomb for food safety and public health. The study underscores the urgent need for better antibiotic stewardship in agriculture. But here’s a thought-provoking question: Are traditional practices like raw milk consumption worth the risk in the face of rising antimicrobial resistance? The authors argue that on-farm antibiotic use directly fuels public health risks, calling for stricter hygiene and responsible antibiotic practices in the dairy sector. What’s your take? Is it time to rethink how we handle our milk, or is this a necessary trade-off for preserving age-old customs?
For more details, check out the full study: Inamullah, et al. Prevalence and antimicrobial resistance characterization of multidrug-resistant Staphylococcus epidermidis isolated from raw milk of dairy cattle and ewes, PLOS One (2025). DOI: 10.1371/journal.pone.0334516 (https://dx.doi.org/10.1371/journal.pone.0334516).
Citation: High rates of antibiotic-resistant bacteria found in raw milk (2025, November 12). Retrieved 12 November 2025 from https://phys.org/news/2025-11-high-antibiotic-resistant-bacteria-raw.html. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
