The escalating threat of antimicrobial resistance (AMR) poses a significant risk to both human and animal health globally. The exponential increase in antibiotic use, coupled with a dwindling pipeline of new antibiotics, exacerbates the danger posed by emerging pathogens. Understanding how resistance develops and spreads is crucial, and a new research initiative, TrophicHealth, is investigating a critical pathway: the role of organic fertilizers derived from livestock in the dissemination of zoonotic pathogens and antimicrobial resistance genes along the food chain.
TrophicHealth aims to unravel the complex interplay between animal agriculture, environmental contamination, and human health. The project focuses on how pathogens and resistance mechanisms move from livestock to the environment – and back again – through the application of manure-based fertilizers. A central question driving the research is whether, and how, the resilience of ecosystems can disrupt this cycle, and what the implications are for the health of people, animals, plants, and the broader environment. This investigation is particularly timely given the growing recognition of the “One Health” approach, which emphasizes the interconnectedness of human, animal, and environmental health.
The rise of antibiotic resistance is not merely a medical problem; it’s an ecological one. Overuse of antibiotics in both human medicine and agriculture creates selective pressure, favoring the survival and proliferation of resistant bacteria. These resistant genes can then spread through various mechanisms, including horizontal gene transfer, where bacteria share genetic material, even across species. The use of animal manure as fertilizer, even as beneficial for soil health, can inadvertently introduce these resistant bacteria and genes into agricultural lands, potentially contaminating crops and entering the food supply. The Robert Koch Institute (RKI) highlights antibiotic resistance as one of the greatest challenges to global health today.
The TrophicHealth Approach: From Farm to Fork
The TrophicHealth consortium is employing a multi-faceted approach to investigate this complex issue. Researchers are conducting extensive field studies at various points along the circular agriculture and food chain. These studies involve collecting samples from livestock, manure, soil, crops, and even irrigation water to identify and characterize the presence of zoonotic pathogens and antimicrobial resistance genes. The findings from these field studies will be validated through laboratory experiments, allowing researchers to isolate and study the mechanisms of resistance and transmission in a controlled environment.
The project’s focus on the “circular economy” is significant. Circular agriculture aims to minimize waste and maximize resource utilization, often involving the recycling of nutrients from livestock manure back into crop production. While this approach offers environmental benefits, it also presents a potential pathway for the spread of AMR. TrophicHealth seeks to understand how to optimize these circular systems to minimize the risk of resistance transmission. This includes exploring strategies to reduce antibiotic use in livestock, improve manure management practices, and enhance the resilience of agricultural ecosystems.
The research will generate hypotheses regarding the potential spread of AMR and pathogens, as well as inform the development of targeted interventions to mitigate these risks. These interventions could include changes in farming practices, improved sanitation measures, and the development of novel technologies to remove or neutralize resistant bacteria and genes from the environment. The project’s ultimate goal is to provide evidence-based recommendations for sustainable agricultural practices that protect both human and animal health.
One Health and the German Government’s Response
TrophicHealth directly contributes to the goals of the German Federal Government’s Health Research Framework Program, specifically the funding guideline of the Federal Ministry of Education and Research (BMBF) promoting transdisciplinary research consortia on “Pandemic Prevention and Response within a One Health Approach.” As outlined in a 2023 Council recommendation, the EU is intensifying its efforts to combat antimicrobial resistance. The BMBF’s funding initiative aims to improve preparedness for and response to future infectious disease outbreaks, strengthen interdisciplinary collaboration in infectious disease research, and foster partnerships with practitioners. The consortia are expected to develop practical solutions for preventing and controlling infections caused by various pathogens and AMR in Germany.
The “One Health” approach is central to this effort. It recognizes that human, animal, and environmental health are interconnected and that addressing health challenges requires collaboration across disciplines. This includes veterinarians, physicians, microbiologists, ecologists, agricultural scientists, and policymakers. By bringing together experts from these diverse fields, TrophicHealth aims to develop holistic solutions that address the root causes of AMR and protect public health.
The Role of Livestock and Manure Management
The intensive livestock industry plays a significant role in the emergence and spread of AMR. According to the animal welfare organization Vier Pfoten, more than 70% of antibiotics are used in animal agriculture. This widespread antibiotic use creates a breeding ground for resistant bacteria, which can then spread to humans through direct contact with animals, consumption of contaminated food, or exposure to contaminated environments.
Manure management practices are particularly critical. Improperly treated manure can contain high concentrations of antibiotics, resistant bacteria, and resistance genes. When this manure is applied to agricultural lands, it can contaminate soil and water sources, potentially leading to the spread of resistance to crops and ultimately to humans. Improving manure management practices, such as composting or anaerobic digestion, can help to reduce the levels of antibiotics and resistant bacteria in manure before This proves applied to fields.
Beyond Germany: A Global Challenge
While TrophicHealth is focused on the German context, the issue of AMR and its link to agricultural practices is a global concern. The World Health Organization (WHO) estimates that antibiotic resistance could lead to 10 million annual deaths by 2050 if no action is taken. This underscores the urgent need for international collaboration to address this threat.
Many countries are implementing strategies to reduce antibiotic use in agriculture and improve manure management practices. These strategies include promoting responsible antibiotic stewardship, investing in research and development of alternative therapies, and strengthening surveillance systems to monitor the emergence and spread of AMR. The TrophicHealth project’s findings will contribute to this global effort by providing valuable insights into the complex pathways of AMR transmission and informing the development of effective interventions.
Looking Ahead: Next Steps and Ongoing Research
The TrophicHealth consortium is currently in the data collection and analysis phase of the project. Researchers are working to identify the key drivers of AMR transmission in agricultural systems and to develop predictive models that can assess the risk of resistance spread under different scenarios. The project is expected to generate preliminary results in late 2026, with a final report and recommendations to be published in 2027.
Ongoing research is also exploring the potential of alternative strategies to reduce antibiotic use in livestock, such as vaccination, improved biosecurity measures, and the use of probiotics and prebiotics to enhance animal health. These approaches offer promising avenues for reducing the reliance on antibiotics and mitigating the risk of AMR.
The fight against antimicrobial resistance requires a concerted effort from all stakeholders, including governments, researchers, healthcare professionals, farmers, and the public. By embracing a “One Health” approach and investing in innovative research, we can protect the effectiveness of antibiotics and safeguard the health of future generations.
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