Wild boars in Brazil found to carry antibiotic-resistant bacteria, raising environmental and public health concerns

A Brazilian study reveals wild boars harbour bacteria resistant to multiple antibiotics, highlighting wildlife as a potential Reservoir for antimicrobial resistance and its risks to human and veterinary medicine.

A Brazilian study has added to evidence that wild boars may be more than an agricultural nuisance: they can also carry bacteria resistant to several common antibiotics. According to the report, researchers found Escherichia coli in 56 of 100 apparently healthy wild boars, and 55 of those isolates showed multi-drug resistance. By contrast, Salmonella was detected in just one sample, and that strain lacked the virulence and resistance markers the team examined.

The resistant E. coli strains were particularly associated with older, inexpensive drugs widely used in both human and veterinary medicine, including sulphonamides, tetracyclines, amoxicillin, ampicillin and doxycycline. The researchers said the result was striking because the animals were not reported to be receiving routine antibiotics, suggesting resistant bacteria may circulate through environmental contact rather than direct treatment alone.

Similar concerns have been reported elsewhere. Studies in Italy, Germany and central Europe have found wild boars carrying extended-spectrum beta-lactamase-producing E. coli and other resistant strains, with some evidence linking prevalence to human population density. Together, the findings reinforce a broader concern: wildlife can act as a reservoir for antimicrobial resistance, creating another pathway between farms, forests and, potentially, people.

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