Antimicrobial Resistance in Wildlife: Environmental Reservoir and Public Health Risk

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-11

Key Takeaways

• Wildlife serve as both reservoirs and vectors for clinically relevant resistant bacteria and resistance genes, acquiring them through environmental pathways such as wastewater, sewage, landfills, and agricultural runoff.
• Plasmid-mediated resistance mechanisms, including ESBL, AmpC, carbapenemase, and colistin resistance genes, are frequently identified in wildlife-associated bacteria, mirroring resistance patterns in human and domestic animal populations.
• Escherichia coli is proposed as a key indicator organism for environmental AMR surveillance in wildlife due to its ubiquity and correlation with resistance in clinically relevant pathogens, though targeted pathogen screening may be necessary for specific threats.
• Transmission pathways from wildlife to humans are complex and often poorly quantified, with direct evidence for environmental transmission remaining limited, necessitating a One Health approach for coordinated action across human, animal, and environmental health sectors.
• Risk assessment for wildlife AMR requires explicit identification of hazards (clinically relevant resistance determinants), exposure pathways (e.g., foraging at contaminated sites), and consequences (compromised last-line therapeutic options), with species-specific ecology being a critical modifying factor.
• Surveillance gaps persist due to the absence of standardized environmental monitoring programs comparable to human and livestock sectors, and a lack of quantitative data on transmission rates, highlighting the need for structured risk characterization and reporting.

Antimicrobial resistance (AMR) in wildlife represents a convergence of ecological, clinical, and public health concerns that veterinary researchers increasingly must address. This article examines the evidence for wildlife as both sentinel and reservoir of clinically relevant resistant bacteria, the transmission pathways linking anthropogenic sources to free-ranging animals, and the implications for human and animal health. It serves the veterinary researcher seeking a structured foundation for designing surveillance studies, interpreting resistance data from wildlife isolates, and communicating risk within a One Health framework.

The central question is whether resistant bacteria and resistance genes in wildlife merely mirror environmental contamination or whether wild animals actively propagate and disseminate these genetic elements across landscapes. The distinction matters for intervention design. If wildlife are passive indicators, mitigation focuses on upstream sources. If they are active vectors, wildlife management becomes part of the control strategy. Current evidence supports both roles simultaneously, with the relative contribution varying by species, habitat, and resistance mechanism.

Wildlife are not directly exposed to clinically relevant antibiotics in most cases, yet resistant bacteria are recovered from free-ranging animals worldwide at rates that parallel those in human and domestic animal populations. This observation underscores the complexity of interspecies transmission and the need to understand environmental pathways that connect clinical antibiotic use to wild fauna.

At a Glance

Conceptual Framework: Wildlife in the AMR Transmission Cycle

The emergence and spread of antimicrobial resistance is attributed to anthropological, animal, and environmental factors operating simultaneously. Human-related drivers include antimicrobial overuse and misuse in medicine, biocides in consumer products, and inadequate sanitation. Animal-related drivers include prophylactic and therapeutic antimicrobial use, feed additives, and resistant bacteria in excreta. Environmental drivers include naturally occurring resistance genes, improper disposal of unused antimicrobials, and contamination from farms, pharmaceutical industries, and public waste. Wildlife occupy a distinctive position at the intersection of these domains, acquiring resistant bacteria from multiple anthropogenic sources while also serving as a conduit for their dispersal.

The One Health initiative formalizes the interdependence of human, animal, and environmental health for zoonotic disease and antimicrobial resistance control. Within this framework, wildlife are not an isolated compartment but a dynamic interface. Their mobility, varied foraging ecology, and proximity to human settlements determine their exposure profile. Synanthropic species such as gulls, corvids, and rodents may have higher carriage rates than species with limited human contact, reflecting their access to contaminated environments.

Wildlife as Environmental Indicators

Wild animals living and feeding in human-influenced habitats can acquire multidrug resistant bacteria selected in hospitals, communities, or livestock operations. Sources include wastewater treatment plant effluent, sewage systems, landfills, agricultural fields, and intensive farming facilities. Because wildlife sample these environments continuously and across broad spatial scales, they function as biological samplers of environmental contamination with antibiotic resistant bacteria.

The level of resistance and the plasmid-mediated mechanisms observed in bacteria of wildlife origin correlate well with the situation described in humans and domestic animals. This correlation supports the use of wildlife as indicators of environmental pollution. However, indicator status does not preclude reservoir status. The same animals that reveal contamination also carry resistant bacteria in their gastrointestinal tracts and can shed them into new environments, completing a cycle that returns resistance elements to sites where human exposure may occur.

Transmission Pathways and Ecological Drivers

Anthropogenic Sources and Wildlife Exposure

Wastewater and manure are consistently identified as contamination sources for resistant bacteria, with molecular data supporting transmission from wastewater to environmental compartments. Wildlife that forage at wastewater treatment facilities, sewage outfalls, or manure-amended fields encounter high densities of resistant Enterobacteriaceae. Gulls and waterfowl are particularly well documented in this regard, given their use of both aquatic habitats and terrestrial foraging sites.

Landfills represent another significant exposure route. Scavenging species that feed on human refuse encounter resistant bacteria selected in clinical and agricultural settings. The persistence of resistance genes in landfill environments, combined with the concentrated animal activity, creates conditions favorable for bacterial exchange and horizontal gene transfer.

Wildlife as Vectors for Dissemination

Once colonized, wildlife can transport resistant bacteria over considerable distances. Migratory birds, in particular, have been implicated in the global dissemination of resistance genes. The capacity for long-distance movement distinguishes wildlife vectors from domestic animal reservoirs, which are typically geographically constrained by farm boundaries. A gull moving between a landfill and a reservoir, or a migratory waterfowl traveling between continents, can introduce resistance elements into environments with no prior anthropogenic contamination.

The identification of epidemic plasmids in samples from human, animal, and wildlife sources underlines the role of horizontal gene transfer in the dissemination of resistance genes. These mobile genetic elements can spread resistance across bacterial species and genera, amplifying the public health significance of any single wildlife carriage event.

Mechanisms of Resistance in Wildlife-Associated Bacteria

Plasmid-Mediated Resistance

Plasmid-mediated resistance to antimicrobial classes of critical importance has been increasingly reported in Enterobacteriaceae from wildlife. The emergence of epidemic plasmids that rapidly disseminate resistance genes among bacterial populations is a defining feature of the current resistance landscape. These plasmids often carry multiple resistance determinants, including extended-spectrum beta-lactamase (ESBL), AmpC beta-lactamase, carbapenemase, and colistin resistance genes.

The recovery of clinically critical resistance genes from wildlife isolates indicates that wild animals are also exposed to environmental bacteria but are also participants in the broader ecology of mobile genetic elements. The same plasmids found in human clinical isolates appear in wildlife-associated bacteria, suggesting a shared genetic pool maintained by ongoing transmission.

Indicator Organizms and Surveillance Design

Escherichia coli has been proposed as an indicator organizm for environmental AMR monitoring, including in wildlife. The rationale is practical: E. coli is ubiquitous, easily cultured, and its resistance phenotypes correlate with those of clinically relevant pathogens. Surveillance programs using E. coli can identify anthropogenic influences and levels of AMR while also allowing for identification of transmissions to and from human and animal populations.

No established environmental monitoring programs currently exist at the national or global level, despite the recognized need. The absence of standardized protocols for wildlife sampling, isolate characterization, and data reporting limits comparability across studies and regions. This gap is particularly consequential for low-resource settings, where intensive poultry farming expansion may increase AMR exposure risks to wildlife and human populations alike.

Evidence Limitations and Interpretive Caution

Direct evidence for transmission of resistant bacteria from wildlife to humans through environmental exposure remains limited. A systematic review of the literature found that among publications addressing both environmental and human isolates, only one compared isolates with a clear spatial and temporal relationship. The abundance of resistant bacteria at exposure-relevant sites, including recreational areas, drinking water, and fresh produce, suggests risk for human exposure, but the magnitude of that risk and the specific contribution of wildlife relative to other sources remain uncertain.

The evidence base is further constrained by the scarcity of quantitative data from environmental compartments and exposure-relevant sites. Most studies report detection or non-detection instead of concentrations or dose-response relationships. For veterinary researchers designing surveillance studies, this means that prevalence data from wildlife must be interpreted with attention to sampling context, species ecology, and the spatial and temporal relationship between wildlife sampling sites and potential anthropogenic sources.

Risk Assessment Framework for Wildlife AMR

A structured risk assessment for wildlife-associated antimicrobial resistance requires explicit definition of the hazard, exposure pathway, and consequence before any sampling or intervention begins. The framework below adapts standard environmental risk assessment logic to the specific problem of AMR in free-ranging fauna.

Hazard Identification

The hazard is not simply the presence of resistant bacteria in a wild animal. It is the presence of resistance determinants that are clinically relevant, mobilizable, and capable of reaching human or domestic animal populations. Bacteria of wildlife origin carrying extended-spectrum beta-lactamase (ESBL), AmpC, carbapenemase, or colistin resistance genes represent the highest concern because these determinants compromise last-line therapeutic options in human medicine Plasmid-mediated resistance is going wild. The detection of epidemic plasmids in wildlife isolates indicates that clinically significant genetic elements are circulating outside clinical and agricultural settings.

Hazard identification must distinguish between resistance that is intrinsic or environmental in origin and resistance that reflects anthropogenic contamination. Wild animals living and feeding in human-influenced habitats acquire multidrug-resistant bacteria selected in hospitals, communities, or livestock operations through wastewater, sewage, landfills, and agricultural fields Plasmid-mediated resistance is going wild. A wildlife isolate carrying a resistance gene identical to one circulating in regional livestock or hospital populations carries different risk implications than a novel determinant with no clinical counterpart.

Exposure Pathway Analysis

The transmission pathway from wildlife to humans or domestic animals requires a defined sequence: source, release, environmental transport, contact, and uptake. Wildlife can serve as both reservoir and vector, with the relative importance of each role varying by species, ecology, and land use context The role of wildlife in the global transmission of antimicrobial resistance genes.

The evidence base for direct wildlife-to-human transmission remains limited. A systematic review of environmental transmission of clinically relevant AMR bacteria found that although resistant organizms were detected at exposure-relevant sites including recreational areas, drinking water, and shellfish, only one study compared isolates with clear spatial and temporal relationships to human cases, and no direct evidence of environmental transmission was established Role of the environment in the transmission of antimicrobial resistance to humans. This does not negate risk, but it requires that risk communication acknowledge uncertainty instead of assert causality.

Exposure Assessment

Exposure assessment quantifies the likelihood and magnitude of contact between a susceptible host and wildlife-sourced resistant bacteria. The following factors determine exposure intensity:

• Species density and aggregation behavior at interfaces with human activity
• Fecal deposition rates in areas used by humans, livestock, or companion animals
• Survival of resistant bacteria in environmental matrices, which varies by organizm, temperature, moisture, and ultraviolet exposure
• Presence of intermediate vectors such as contaminated water, soil, or invertebrates
• Seasonal movement patterns that bring wildlife into closer contact with human or agricultural systems

Wild birds merit particular attention because their mobility, broad foraging ecology, and use of both natural and anthropogenic habitats position them as efficient vectors for resistance gene dissemination across geographic scales The role of wildlife in the global transmission of antimicrobial resistance genes. Gulls, waterfowl, and corvids that forage at landfills and wastewater treatment facilities can transport resistant organizms to recreational water bodies, agricultural fields, and urban environments.

Consequence Assessment

Consequence assessment considers the clinical and public health impact if exposure leads to colonization or infection. Factors that amplify consequences include:

• Resistance to antimicrobial classes designated as critically important for human medicine
• Presence of mobile genetic elements that can transfer resistance to other bacteria in the new host
• Patient populations with increased susceptibility, including immunocompromised individuals, young children, and the elderly
• Healthcare settings where resistant organizms can propagate and cause nosocomial outbreaks
• Agricultural settings where resistant organizms can enter food production chains

The level of resistance and the plasmid-mediated mechanisms observed in bacteria of wildlife origin correlate with the situation described in humans and domestic animals, suggesting that wildlife surveillance can serve as a sentinel for resistance circulating in broader ecosystems Plasmid-mediated resistance is going wild. This correlation strengthens the argument for including wildlife in One Health surveillance programs WHO One Health initiative.

Risk Characterization and Decision Criteria

Risk characterization integrates hazard, exposure, and consequence assessments into a categorical judgment that supports management decisions. A practical scoring system assigns values to each component:

Total scores of 5 to 7 warrant continued surveillance. Scores of 8 to 10 justify targeted investigation of transmission pathways and source identification. Scores of 11 to 15 indicate the need for active intervention, which may include biosecurity measures at agricultural interfaces, waste management improvements, or public health notification.

Species-Specific Considerations

The correct risk assessment varies substantially by wildlife species, and a framework that does not account for ecological and behavioral differences will misclassify risk. Migratory waterfowl that winter in agricultural regions and breed in Arctic habitats can transport resistance genes across continents, whereas a territorial rodent with a restricted home range presents a localized risk. Scavenging species that feed at landfills or livestock mortality sites have higher exposure probability than obligate herbivores in protected areas. Species that defecate in water sources used by humans or livestock create more direct transmission pathways than species that deposit feces in remote terrestrial habitats.

The absence of environmental monitoring programs in most jurisdictions means that wildlife surveillance data are often the only indicator of AMR circulation outside clinical and agricultural sectors The potential of using E. coli as an indicator for the surveillance of antimicrobial resistance in the environment. Risk assessments must therefore be updated as new surveillance data become available, and the absence of detected resistance should not be interpreted as proof of absence.

Documentation and Reporting

Risk assessment findings should be documented in a format that supports both scientific review and public health decision-making. Minimum documentation elements include:

• Species, location, date, and sampling method for each wildlife isolate
• Bacterial species identification and antimicrobial susceptibility profile
• Resistance mechanism characterization, including plasmid typing where performed
• Spatial and temporal relationship to potential anthropogenic sources
• Assessment of exposure pathways with explicit reasoning
• Categorical risk score and recommended actions
• Limitations, including sample size, selection bias, and laboratory method constraints

Reporting should distinguish between surveillance findings that indicate environmental contamination and those that demonstrate active transmission to humans or domestic animals. The distinction matters because the former supports source control measures while the latter requires clinical and public health intervention CDC One Health and zoonotic disease resources. Veterinary professionals engaged in wildlife AMR surveillance should align their reporting formats with national and international surveillance standards where these exist, and should consult current professional guidance for species-specific sampling and interpretation protocols MSD Veterinary Manual professional edition.

Recognized Complications and Failure Modes

Surveillance programs for wildlife AMR fail in characteriztic ways. The most common is sampling bias toward synanthropic species. Gulls, corvids, starlings, and urban rodents dominate published datasets because they are accessible and their habitats overlap with anthropogenic waste streams. This creates a circular inference problem: the same species that best indicate environmental contamination are the least representative of wildlife generally. Detection of resistance in these species confirms exposure but says little about transmission dynamics in undisturbed ecosystems. Discriminating between the two requires paired sampling of sympatric species with different foraging ecologies, such as a terrestrial scavenger alongside an aerial insectivore, within the same catchment.

A second failure mode is the conflation of carriage with infection or shedding. Isolation of a resistant Escherichia coli from a cloacal swab demonstrates colonisation, not active infection, and does not quantify the direction or magnitude of transmission. Longitudinal sampling with strain typing is required to distinguish transient passage from persistent carriage. A single positive sample from a migratory bird may represent acquisition at an unknown stopover site days earlier, not local transmission.

Laboratory methodology introduces further divergence. Phenotypic susceptibility testing, whole-genome sequencing, and targeted PCR for resistance genes answer different questions. Phenotypic panels detect expressed resistance but miss silent genes. Genomic methods identify resistance determinants but cannot confirm expression or clinical relevance. Surveillance programs that switch methods between sampling rounds produce non-comparable datasets. The absence of standardized environmental breakpoints compounds this problem, interpretive criteria derived from clinical human isolates may misclassify wildlife isolates with different expression profiles.

Early detection of these failures depends on internal quality controls. Duplicate sampling, blinded re-testing of a subset, and inclusion of reference strains expose laboratory drift. Metadata audits reveal sampling bias before it distorts conclusions. Programs should track the proportion of samples from each ecological guild and flag when any single guild exceeds a predefined threshold.

Common Errors and Corrective Action

Less experienced investigators frequently over-interpret prevalence data from small sample sizes. A single resistant isolate from a sample of ten animals does not establish a reservoir, the confidence interval spans nearly the entire possible range. Reporting prevalence without confidence intervals or sample size justification invites erroneous conclusions. The corrective action is to report raw counts alongside percentages and to apply exact binomial confidence intervals appropriate to the sample size.

A related error is the assumption that detection of a resistance gene implies recent anthropogenic exposure. Many resistance determinants, particularly those encoding efflux pumps or chromosomal β-lactamases, predate the clinical use of antibiotics. Environmental bacteria harbour diverse resistance genes that can transfer to wildlife-associated pathogens without any selective pressure from human activity. Attribution to anthropogenic sources requires epidemiological context, including temporal trends, spatial gradients relative to contamination sources, and genetic comparison with human and domestic animal isolates. The evidence base for direct wildlife-to-human transmission through environmental pathways remains limited, with few studies achieving the spatial and temporal matching needed to demonstrate transmission. Wildlife should therefore be regarded as sentinels and potential vectors, not proven sources of human infection.

Misclassification of wildlife species as reservoirs instead of spillover hosts is a third common error. A reservoir sustains a pathogen or resistance element within its population. A spillover host acquires it transiently from another source. The distinction matters for intervention design. Culling or habitat manipulation directed at a spillover host will not reduce resistance if the true reservoir is livestock effluent or wastewater. Determining reservoir status requires evidence of within-population maintenance, such as persistent carriage across seasons or vertical transmission, also repeated detection.

Evidence Limitations and Divergent Expert Opinion

The published literature on wildlife AMR is dominated by cross-sectional studies from high-income countries, with marked geographic and taxonomic bias. Longitudinal datasets are scarce, and quantitative data on transmission rates between wildlife and humans are almost entirely absent. Reviews consistently identify this gap, noting that while resistant bacteria are readily detected in wildlife, direct evidence for transmission to humans through environmental exposure is lacking. Expert opinion diverges on the public health significance of this finding. Some argue that the abundance of resistant bacteria at exposure-relevant sites, including recreational water and fresh produce, justifies precautionary intervention. Others contend that the absence of demonstrated transmission means wildlife AMR remains an ecological and animal health concern instead of a demonstrated human health threat.

A second area of disagreement concerns the choice of indicator organizm. E. coli is widely proposed as the preferred sentinel because it is commensal, easily cultured, and reflects the resistance burden of the host gut. Critics note that E. coli does not necessarily predict the behavior of clinically critical pathogens such as carbapenemase-producing Enterobacteriaceae, which may be carried at lower prevalence and require targeted screening. The selection of indicators should therefore follow the surveillance objective: E. coli for general burden, targeted pathogens for specific clinical threats.

Referral, Consultation, and Reporting Triggers

Wildlife AMR findings rarely require immediate regulatory action, but specific circumstances warrant escalation. Detection of carbapenemase-producing organizms or resistance to last-resort antimicrobials, such as colistin or tigecycline, in wildlife-associated bacteria should trigger consultation with public health authorities and reference laboratories. These determinants are rare in wildlife and their presence suggests recent acquisition from a clinical or agricultural source. Confirmation by a reference laboratory is mandatory before any public communication, given the potential for misinterpretation.

Detection of the same epidemic plasmid in wildlife, domestic animal, and human isolates constitutes a stronger signal for interspecies transmission than detection of the same bacterial species alone. Plasmid typing and whole-genome comparison should be performed to establish genetic relatedness. Findings that suggest a point-source outbreak, such as multiple resistant isolates from wildlife clustered around a single wastewater outfall, warrant notification of the relevant environmental agency.

Veterinarians encountering resistant infections in wildlife presented for treatment should follow established laboratory reporting protocols for notifiable organizms and should consult current antimicrobial susceptibility breakpoints for the species concerned. The MSD Veterinary Manual provides species-specific guidance on antimicrobial selection and interpretation. Where wildlife rehabilitation facilities observe resistance patterns that change over time, systematic recording and annual review can contribute to regional surveillance without requiring formal research infrastructure. International standards for animal health surveillance, including those published by WOAH, provide a framework for structuring such data collection and for determining when findings cross the threshold for official reporting.

Frequently Asked Questions

How Should I Prioritize AMR Testing in Wildlife When Funding and Laboratory Access Are Limited?

Prioritize sampling that answers a defined question instead of attempting broad surveillance. If the goal is detecting anthropogenic pollution, sample species with limited home ranges that forage in human-influenced habitats, such as gulls, corvids, or rodents near wastewater outfalls. If the goal is public health risk, prioritize species with high contact rates with livestock or human populations. Escherichia coli remains the most practical indicator organizm because it is inexpensive to culture, widely distributed, and provides comparable data across studies. Reserve molecular methods such as whole-genome sequencing or plasmid characterization for isolates with phenotypic resistance to critically important antimicrobial classes. When laboratory capacity is absent, consider partnering with academic or reference laboratories and storing isolates on commercial transport swabs for batch submission.

What Sampling Strategy Is Appropriate When I Cannot Access Ideal Equipment Such as Fecal Swabs or Cryogenic Storage?

Use sterile plain swabs or freshly collected fecal material placed in sterile containers when commercial transport media are unavailable. Process samples within 24 hours if refrigeration is possible, or use selective enrichment broths that tolerate ambient temperature for short periods. Avoid pooling samples from multiple individuals unless the surveillance question explicitly targets population-level prevalence, because pooling obscures individual carriage rates and complicates interpretation. Wild birds can be sampled non-invasively from roosting sites or feeding areas, which reduces the need for capture equipment. Document storage conditions and time-to-culture meticulously, because delayed processing biases recovery of fastidious organizms and may underestimate carriage of resistant strains. If cryogenic storage is unavailable, prioritize culture within 48 hours and archive isolates on agar slants at room temperature for short-term maintenance.

How Do I Interpret a Resistant Isolate from a Wildlife Sample When There Is No Known Local Anthropogenic Source?

Resistance in wildlife does not require direct antibiotic exposure. Wild animals can acquire multidrug-resistant bacteria from diverse environmental sources including wastewater, sewage systems, landfills, and agricultural fields, even when no obvious point source is identified. Consider landscape-scale factors such as upstream catchment areas, migratory flyways, and seasonal agricultural activity. The level of resistance in wildlife-associated bacteria often correlates with the situation described in humans and domestic animals, so compare your isolate with regional human and livestock surveillance data where available. Absence of a local source may reflect long-distance transport by migratory species or persistence of resistance genes in environmental reservoirs. Report the finding with explicit acknowledgment of the uncertainty regarding source attribution, and consider whether the isolate carries epidemic plasmids that would suggest recent horizontal gene transfer from clinical or agricultural settings.

What Records Should I Maintain for Wildlife AMR Surveillance to Support Future Research or Regulatory Review?

Record species, age class if determinable, sex, capture location with GPS coordinates, date, sampling method, and habitat description. Document the sample matrix, storage conditions, transport time, and culture methods including selective media and incubation parameters. For each isolate, record phenotypic susceptibility results with the method used, such as disk diffusion or broth microdilution, and the interpretive standards applied. Note any typing results, resistance genes detected, and plasmid characterization data. Environmental AMR monitoring programs should allow for identification of transmissions to and from human and animal populations, so include metadata on proximity to anthropogenic features such as farms, wastewater treatment plants, or landfills. Archive isolates in a recognized culture collection where possible, and maintain raw data files in open formats to facilitate future meta-analyzes.

How Should I Explain Wildlife AMR Findings to a Client, Landowner, or Public Health Official Without Causing Alarm?

Frame the finding as an environmental indicator instead of an immediate disease threat. Explain that wildlife can acquire resistant bacteria from human-influenced habitats and act as reservoirs and vectors, but that detection of a resistant isolate does not confirm transmission to humans or domestic animals. Describe the One Health framework, which links human, animal, and environmental health for antimicrobial resistance control, as endorsed by the World Health Organization One Health initiative. Emphasize practical risk-reduction measures such as proper waste management, biosecurity around livestock facilities, and hand hygiene after wildlife contact. Avoid speculative statements about disease outbreaks, and refer to regional public health authorities for formal risk communication. Provide written documentation of the findings and offer to discuss implications with their veterinarian or physician.

How Do Management Recommendations Differ for Free-Ranging Wildlife Versus Rehabilitated or Captive Wildlife?

Free-ranging wildlife management focuses on source reduction and habitat-level interventions, because individual treatment is rarely feasible or appropriate. Recommendations center on reducing anthropogenic contamination of foraging and breeding habitats, securing waste disposal, and limiting wildlife access to livestock feed and water. For rehabilitated or captive wildlife, individual animal management becomes relevant. These animals may acquire resistant bacteria during captivity through contaminated food, water, or contact with human handlers. Prophylactic and therapeutic antimicrobial misuse in animal settings contributes to resistance emergence, so antimicrobial use in rehabilitation facilities should follow the same stewardship principles applied in domestic animal practice. Culture-directed therapy, infection control protocols, and barrier nursing are appropriate. Release decisions should consider whether carriage of resistant organizms poses risk to wild populations, although evidence for transmission from released individuals to free-ranging conspecifics remains limited.

Related Clinical & Scientific Guides

• Wildlife Disease Surveillance: Designing and Implementing a One Health Program
• Biosecurity Risk Assessment for Livestock Operations: A Practical Framework
• Rabies Post-Exposure Prophylaxis in Veterinary Personnel

References and Further Reading

• Potential Causes of Spread of Antimicrobial Resistance and Preventive Measures in One Health Perspective-A Review.. 2023.
• Role of the Environment in the Transmission of Antimicrobial Resistance to Humans: A Review.. 2015.
• A Review of Antimicrobial Resistance in Poultry Farming within Low-Resource Settings.. 2020.
• Plasmid-mediated resistance is going wild.. 2018.
• The potential of using E. coli as an indicator for the surveillance of antimicrobial resistance (AMR) in the environment.. 2021.
• The role of wildlife (wild birds) in the global transmission of antimicrobial resistance genes.. 2017.
• WHO One Health Initiative. WHO.
• CDC One Health and Zoonotic Disease Resources. CDC.
• MSD Veterinary Manual, Professional Edition. MSD Veterinary Manual.

Related Articles

• Veterinary Public Health and Wildlife Trade: Risk Assessment
• Antimicrobial Resistance Surveillance in Wildlife: Methods and Gaps
• One Health Approach to Antimicrobial Resistance: A Veterinary Perspective
• Zoonotic Parasites in Wildlife: Diagnostic Challenges and Public Health Implications
• Veterinary Public Health and Food Safety: A Systems Approach

This article is educational professional reference material for veterinary audiences. It is not a substitute for veterinary diagnosis, individual clinical judgment, current product labeling, or applicable regulatory requirements.