Antibiotic-resistant bacteria found in Canterbury cockles and watercress

Publicly released:
New Zealand
Image by Nebular Group on UnSplash
Image by Nebular Group on UnSplash

Antibiotic-resistant bacteria has been detected in wild cockles and watercress, putting communities who rely on mahinga kai at risk of E.coli infections that are resistant to treatment. Researchers found that Canterbury waterways contained high levels of fecal bacteria, and the food sources had up to 60-times more bacteria than the water. Up to 1 in 5 of them were resistant to the most commonly-prescribed antibiotics in Aotearoa, and some were resistant to antibiotics used as a last resort. Authors of the study say that as the amount of antibiotic resistant bacteria in the environment increases, existing measures of water quality will increasingly underestimate the risks to people who harvest from our waterways.

Media release

From: University of Canterbury

Author comment from Professor Jack Heinemann 

“Wild food (mahinga kai) harvesting puts people and communities at risk of contracting antibiotic resistant infections, but nobody is monitoring this risk or providing specialist guidance to those who rely upon wild foods.

“Wild food harvesting is an important source of nutrition, especially for indigenous communities, and an intergenerational 'classroom' for sharing cultural knowledge and skills. All communities may rely more heavily on wild food harvest during a disaster, such as earthquakes or regional flooding.

“But we found that wild foods are also where antibiotic resistant bacteria concentrate, putting vulnerable communities at heightened risk.

“With the help of Te Ngāi Tūāhuriri Rūnanga and Environment Canterbury, we found that Canterbury waterways had high levels of potential disease-causing bacteria and worse: they were often resistant to antibiotics, too. Plants and animals taken for kai could have  up to 60-times more bacteria than did the water. Up to 1 in 5 of them were resistant to first choice antibiotics, and amongst them were also some resistant to antibiotics of last resort.

“We believe that existing water safety guidance is inadequate to address additional risk from antibiotic resistance. We argue that a One Health approach is needed to maintain the benefits of harvesting wild foods.”

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Research Elsevier, Web page
Journal/
conference:
Environmental Pollution
Research:Paper
Organisation/s: University of Canterbury, Massey University, Bioprotection Research Centre, NZ
Funder: Sophie van Hamelsveld was supported by a UC Doctoral Scholarship, UC Alumni Scholarship and the Sam and Pam Stewart Memorial Award. This research otherwise did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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