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Open research questions in Pharmaceutical and Antibiotic Environmental Impacts

40 unresolved questions extracted from the limitations and future-work sections of 342 Pharmaceutical and Antibiotic Environmental Impacts papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • However, the effects of these compounds on intracellular transposition within bacterial isolates, a major driver of AMR, have not been previously assessed.

    Effects of different concentrations and combinations of antibiotics on the dynamics of intracellular transposition in Escherichia coli · 2026 · DOI

  • Of the other understudied beta-lactamases, we describe bla MCA within p dif- modules across highly varying contexts suggesting its recent acquisition events.

    Long-read metagenomics and methylation-based binning support the discovery of antibiotic resistance gene–host associations in complex communities · 2026 · DOI

  • Combined sewer overflows (CSOs) are a major pathway for untreated wastewater into urban streams, yet their role in shaping antimicrobial resistance (AMR) dynamics remains poorly understood.

    Cycles of contamination and recovery: Combined sewer overflows drive acute but transient antimicrobial resistance exposure in an urban stream · 2026 · DOI

  • 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 While this study identifies taxa, pathogens, and genes that overlap across sewer niches in a full-scale hospital setting, a key limitation is the assumption that shared taxa between wastewater and biofilms reflect biofilms acting as a microbial reservoir that (i.

    Biofilm Contributions of Bacterial Pathogens and Antimicrobial Resistance Genes to Wastewater Surveillance Signal at the Hospital Scale · 2026 · DOI

  • Although the annual desilting of the UGC is conducted to maintain hydraulic flow, the ecological impacts of this activity on emerging contaminants remain poorly understood.

    Evaluation of the Abundance of Microplastics and Antibiotic Resistance Genes in the Upper Ganga Canal during the Yearly Desilting Cycle · 2026 · DOI

  • Desvenlafaxine, a serotonin-norepinephrine reuptake inhibitor (SNRI) listed on the EU Surface Water Watch Lists, is among the most frequently detected antidepressants in WWTP effluents, yet its role in HGT has not been examined.

    Antidepressant desvenlafaxine identified in wastewater promotes transformation and antibiotic resistance risk in Acinetobacter baylyi via metabolic adaptations · 2026 · DOI

  • Although the FAO, WHO, and WOAH worldwide recommendations promote monitoring and the prudent use of antibiotics, their effectiveness is still limited by a lack of infrastructure, political will, and harmonization.

    Antimicrobial resistance in aquaculture an overview of current status and possible solutions to the issue · 2026 · DOI

  • techniques, evaluating Future research should concentrate on creating new the combined detection impacts of drug mixtures, and incorporating environmental factors into the process of drug development. The cooperation among scientists, government officials, and the pharmaceutical sector will be essential [2, 4].

    Pharmaceutical Pollution in Aquatic Environments and Public Health Risks · 2026 · DOI

  • The isolation of multidrug-resistant Klebsiella pneumoniae from a karst drinking water source indicates a potential exposure pathway for the local population. However, the presence of ARGs and resistant opportunistic pathogens in surface waters does not directly predict clinical outbreaks; rather, it highlights a silent dissemination of resistance traits that could complicate long-term public health management. Given the high permeability of karst aquifers, conventional water quality metrics may not fully capture the biological risks associated with the environmental resistome (Surette and Wright, 2017). Based on these specific correlations, we propose several restrained policy recommendations for karst drinking water management.

    Concordance between environmental resistomes and pathogenic phenotypes: a case study of multidrug-resistant Klebsiella pneumoniae in a drinking water source in Guizhou, China · 2026 · DOI

  • Despite providing critical insights into the karst aquatic resistome, this study has several limitations. First, metagenomic sequencing was strategically prioritized for the highly contaminated hotspots (samples W1 and W2) identified during the initial chemical screening. While this targeted approach effectively characterized the most critical environmental risks, it limited the high-resolution profiling of spatial and temporal resistance dynamics across the broader background monitoring sites.n addition, although seven monitoring sites were initially surveyed, sequencing and mechanistic validation were metagenomic ultimately concentrated on the two hotspot samples and a single representative isolate, which limited the overall sample size and may affect the generalizability of the findings. Second, the reliance on traditional culture-dependent methods for phenotypic validation inherently introduces cultivation bias. Consequently, the obtained isolates, including the multidrug- resistant Klebsiella pneumoniae, represent only a fraction of the environmental microbiome, potentially excluding viable but non- culturable organisms that may also harbor and disseminate ARGs. Finally, although the functional co-clustering of ARGs and mobile genetic elements strongly indicates a high potential for horizontal gene transfer, this study did not perform in vitro conjugation assays to experimentally confirm the physical mobility of these resistance determinants. Furthermore, the mechanistic validation via RT-qPCR was explicitly focused on the tetA efflux pump in a single representative isolate. Future investigations should incorporate broad-spectrum metatranscriptomics and experimental conjugation models to fully elucidate the active transmission networks of the resistome in karst hydrologic systems.

    Concordance between environmental resistomes and pathogenic phenotypes: a case study of multidrug-resistant Klebsiella pneumoniae in a drinking water source in Guizhou, China · 2026 · DOI

  • Antibiotic resistance genes (ARGs) and metal(loid) resistance genes (MRGs) coexist in organic fertilized agroecosystems based on their correlations in abundance, yet evidence for the genetic linkage of ARG-MRGs co-selected by organic fertilization remains elusive.

    Organic fertilization co-selects genetically linked antibiotic and metal(loid) resistance genes in global soil microbiome · 2024 · DOI

  • In order to prevent its spread, the WHO, OIE and FAO have formed an alliance to promote the study of antibiotic resistance evolution in human, animal and environmental bacteria posing a public health threat; however, the studies performed in wild animals are scarce so far.

    Antimicrobial resistance of <i>Enterococcus</i> species isolated from wild mammals in Aragón, Spain · 2022 · DOI

  • 3,4,5,6,7,8,9,10 The extent of this epidemiologic “spillover” to date is uncertain— assertions of the extent of bacterial resistance arising from farms vary widely—and this needs to be a higher research priority.

    Curtailing antibiotic use in agriculture · 2002 · DOI

  • Chemically complex pharmaceutical mixtures in wastewater and sludge can affect microbial adaptation; however, the responses to different co-occurring compounds have not been elucidated well.

    A Two-Arm Metabolic-Efflux Adaptation Framework in Klebsiella pneumoniae under Mixed Pharmaceutical Exposure: rutA-Linked Oxidative Entry and rutR-Associated Regulation · 2026 · DOI

  • Future research should focus on compound isolation and ecological monitoring to harness their potential while mitigating associ- ated risks.

    Marine biofilms as reservoirs of antimicrobial bacteria: molecular identification and functional characterization of epibiotic culturable communities from biofouling invertebrates in northern Tunisia · 2026 · DOI

  • However, a major limitation of metagenomic datasets is their compositional nature, which prevents direct quantification of absolute abundances and complicates cross-sample comparisons.

    Calibrating for absolute microbiome abundances without spike-ins · 2026 · DOI

  • Despite the widespread use of physicochemical treatments to reduce organic load and suspended solids in slaughterhouse wastewater, their impact on microbial communities and resistome remains poorly characterized.

    Long-read metagenomics reveals stable resistome and microbiome in treated Italian slaughterhouse wastewater: a preliminary study · 2026 · DOI

  • One of the strengths of this work is the fact that it addresses the aspects that have been generally understudied in the past, specifically the environmental pathways and wastewater-based surveillance, as well as new diagnostic tools such as metagenomics and sensor-based diagnostics.

    Current global challenges and innovative strategies to combat antimicrobial resistance · 2026 · DOI

  • Knowledge on the composition of the microflora of people living in livestock farm vicinity is insufficient to conclude about changes in the microbiome caused by the environmental emission of bioaerosol.

    Zoonotic bacteria in the vicinity of animal farms as a factor disturbing the human microbiome: a review · 2024 · DOI

  • While the accumulation and fate of MPs and antibiotics in marine ecosystems have been extensively studied, their combined pollution behavior in terrestrial environments remains relatively underexplored.

    Antibiotic sorption onto MPs in terrestrial environment: a critical review of the transport, bioaccumulation, ecotoxicological effects and prospects · 2024 · DOI

  • This review aims to fill the current gap in the literature by offering a thorough and systematic overview of the structure, bioactivity mechanism, detection methods, microbial degradation pathways, and molecular mechanisms of all tetracycline antibiotics in various microorganisms.

    Microbial Degradation of Tetracycline Antibiotics: Mechanisms and Environmental Implications · 2024 · DOI

  • Hereafter to understand the holistic picture of the impacts associated with antibiotics on the environment, the evolution of individual antibiotic pathways for therapeutic and non-therapeutic purposes needs to be studied along with their effect on the environment.

    Emergence of antibiotic resistance due to the excessive use of antibiotics in medicines and feed additives: A global scenario with emphasis on the Indian perspective · 2024 · DOI

  • This points to the need for additional study of its genetic determinants and investigation of the sources and measures to avoid contributory environmental contamination.

    Antimicrobial resistance of <i>Enterococcus</i> species isolated from wild mammals in Aragón, Spain · 2022 · DOI

  • Very little is known about pond sediment contamination with metals and the co-selecting potentials of antimicrobials and chemicals used in aquaculture in developing countries.

    Heavy metals (Cu and Zn) contamination of pond sediment and co-occurrence of metal and antibiotic resistance in <i>Escherichia coli</i> from Nigerian aquaculture · 2020 · DOI

  • Following excretion, antibiotics are transported through the environment via runoff, leaching, and land application of manure; however, airborne transport from feed yards has not been characterized.

    Antibiotics, Bacteria, and Antibiotic Resistance Genes: Aerial Transport from Cattle Feed Yards via Particulate Matter · 2015 · DOI

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40 open questions have been extracted from the limitations and future-work passages of 342 Pharmaceutical and Antibiotic Environmental Impacts papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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