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Enhancing antimicrobial resistance surveillance and research: a systematic scoping review on the possibilities, yield and methods of data linkage studies
Antimicrobial Resistance & Infection Control volume 14, Article number: 25 (2025)
Abstract
Background
Surveillance data on antimicrobial resistance (AMR) determinants such as antibiotic use, prevalence of AMR, antimicrobial stewardship, and infection prevention and control are mostly analysed and reported separately, although they are inextricably linked to each other. The impact of surveillance and research can be enhanced by linking these data. This systematic scoping review aims to summarize the studies that link AMR data and evaluate whether they yield new results, implications, or recommendations for practice.
Methods
For this review, data linkage is defined as the process of linking records, from at least two independent data sources on either (I) at least two AMR determinants or (II) one AMR determinant and one or more general population characteristics. Data linkage should be performed on the level of a certain entity which, in the context of this review, can encompass persons, healthcare institutes, geographical regions or countries. A systematic literature search was performed on February 7th 2025 in Embase.com, PubMed and Scopus to identify AMR data linkage studies.
Results
Forty-eight articles were included in our review. Most data linkage studies used two data sources, and most studies were published in the last 5 years (n = 23 in 2020–2024). A predominance of studies linked data on geographical location, and thirteen studies linked data on individual patient level. Findings demonstrate that the majority of studies (43/48) had added value and provided recommendations for clinical practice and future policies or had suggestions for further research and surveillance. Additionally, data linkage studies appeared to be suitable for hypothesis generating. Several limitations were identified. Most studies had ecological designs, which are prone to ecological fallacy and unobserved confounding, making it hard to establish causality.
Conclusion
This systematic scoping review showed that AMR data linkage studies are increasingly performed. They have potential to gain a more comprehensive understanding of AMR dynamics by generating hypotheses, assisting in optimisation of surveillance, and interpretation of data in the context of guideline/policy development. To increase the added value of data linkage, more studies should be performed to improve knowledge on methodological approaches, data access, data management, and governance issues.
Clinical trial number
Not applicable.
Background
Antimicrobial resistance (AMR), has emerged as one of the leading public health threats worldwide [1]. Appropriate antibiotic use and the prevention of transmission of resistant bacteria are the cornerstones in the control of AMR. Reliable epidemiological information about the prevalence and impact of AMR is essential to implement practical and focused measures regarding antibiotic use and infection prevention. Although they are inextricably linked to each other, data on AMR determinants such as antibiotic use, prevalence of AMR, antimicrobial stewardship (AMS), and infection prevention and control (IPC) are mostly analysed and reported separately. The impact of surveillance and research can be enhanced by combining data on these different AMR determinants, as well as by combining these data with data from population characteristics [2]. Linking data sources on for example institutional level or geographical location gives the opportunity to identify correlations and trends between different determinants. These insights could help in defining new hypotheses and contribute to rational adaptation of e.g. clinical guidelines or local/national IPC practices. However, it is not clear to what extent AMR data linkage studies have been performed, what their challenges are, and what their yield is.
Several cases illustrate the advantage of linking AMR data from different data sources. As an example, the European Union agencies deliver joint inter-agency antimicrobial consumption and resistance analysis (JIACRA) reports [3]. They analyse data from humans and food-producing animals on AMR and antibiotic use, which provides valuable insights for policymakers. Another example is the study of Lishman et al. [4], which linked prescription data of first-line antibiotics to incidence data of resistant urinary tract infection (UTI) related bacteraemia, on the level of primary care practice. Indeed, the antibiotics that were prescribed more frequently were associated with higher incidences of resistant bacteria causing bloodstream infections. The results indicate that a reduction in the prescriptions for UTIs in primary care could lead to a decrease in resistant bacteria causing infections. Additionally, a data linkage study assessing the effect of antibiotic use on AMR at a country level [5] found an immediate increase and persistent upward trend in AMR, following a rise in antibiotic use in the same or a neighbouring country, highlighting the need for international cooperation and policies to discourage overuse of antibiotics. These examples underscore the potential of linking AMR data.
Here, we conducted a systematic scoping review to investigate the extent to which AMR data linkage studies have been performed and to identify their challenges. Our focus is on the yield and added value of merging different AMR-related data sources, including (1) recommendations for clinical practice, (2) implications for guiding future policies, (3) suggestions for future research, and (4) suggestions for surveillance.
Methods
This systematic scoping review was conducted following the methods outlined by Arksey & O’Malley [6]. Results were reported according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis Extension for Scoping Reviews (PRISMA-ScR) Statement, for which a checklist is provided in Additional file 1. [7].
Definition of data linkage
For the purpose of this review, data linkage is defined as the process of linking records, from at least two independent data sources on either (I) two or more AMR determinants or (II) at least one AMR determinant and one or more general population characteristics. Data linkage should be performed on the level of a certain entity which, in the context of this review, can encompass persons, healthcare institutes, geographical regions or countries. Years and other defined time periods are not considered appropriate entities for data linkage.
Search strategy
The search strategy was developed in consultation with an experienced information specialist. We focused on three main concepts: (1) terms related to data linkage, (2) terms related to AMR and antibiotic use, and (3) terms related to AMS. A combination of synonyms and wildcards was used to ensure a comprehensive search. Records needed to refer to concept 1 and either concept 2 or concept 3 in the title to be included. The final search strategy can be found in Additional file 2, with the different concepts given in different colours. Scientific databases Embase.com, PubMed and Scopus were searched for relevant articles on February 7th, 2025. There were no publication date restrictions. The identified records were exported to the citation management program Endnote (version 21.0.1), and duplicate records were removed.
Inclusion and exclusion criteria
Studies were eligible for inclusion if the method of data linkage met our definition as described above. We focused only on studies on antibiotic resistance, i.e. studies on antivirals, antifungals, and antiparasitics were excluded. In addition, studies were considered eligible if their study aim focused on determining the effect of AMS interventions, antibiotic use, other AMR determinants, or general population characteristics on an AMR related outcome (for instance AMR prevalence or antibiotic use). At least one of the AMR determinants included in the studies should concern human data. Studies for which additional data collection as a new data source was performed, e.g. by sending out questionnaires, could be included, but at least one data source should already have been existing in advance.
Studies were excluded if the data source used for linkage was a literature review. Furthermore, studies were excluded when no full text was available in English, and when the design concerned a clinical trial, meta-analysis, or systematic review.
Study selection
Titles and abstracts of records resulting from the systematic literature search, were screened for eligibility independently by two reviewers (SK and CW). Online software Rayyan was used. Discrepancies were solved by consensus with the help of a third reviewer (AS). Subsequently, the full texts of the reports were read (SK read all papers, CW and AS each read 50% (to a total of 100%)) and a final selection for inclusion was made.
Data charting
A data charting form was developed to guide the data charting process. The extracted variables comprised general study characteristics like title, first author, year of publication, country, and research question. In addition, the number and types of data sources used, level of data linkage, and the type of analysis performed were extracted from the studies. Lastly the key findings, recommendations and implications for use, and the strengths and limitations regarding data linkage were recorded. One reviewer (SK) charted the data and the results were verified by two other members of the team (CW and AS) by cross-checking selected sections of the data against the original articles to ensure accuracy. Extracted data were interpreted.
Results
Study selection
The literature search yielded 673 records, of which 249 duplicates were removed. After screening title and abstract, another 304 records were excluded. Fifteen records could not be retrieved. One hundred and five reports were assessed for eligibility. Fifty-seven reports were excluded because they did not match the eligibility criteria. The most common reason for exclusion was that the study diverged from our definition of a data linkage study (n = 33). For instance, some studies linked data from a single source, such as different parts of electronic patient files, or linked data at a year level. Other reasons for exclusion were the use of only one AMR determinant and no data on general population characteristics (n = 22), the use of data from a systematic review (n = 1), and a different study aim being creating a web-based application (n = 1). In total, 48 articles were included in this scoping review. A summary of the article selection process is provided in a PRISMA flowchart (Fig. 1).
Flow diagram of study selection (From: Page et al. [8]
Study characteristics
Of the 48 identified AMR data linkage studies, the majority had an ecological design, characterized by group-level data and aggregated measures, often used to explore potential associations. Most articles were published in the last five years (n = 23 in 2020–2024). The oldest data linkage study found was published in 1998. Fifteen studies linked data from multiple countries, of which nine included only European countries and six included data from countries from multiple continents. Most single-country studies were performed in England (n = 8) and the United States (n = 8), followed by the Netherlands (n = 3) and Japan (n = 3).
More than half of the included studies linked data on geographical locations. Specifically, thirteen studies used country-level data, and fourteen studies linked data on the regional level, which varied from province or district to city level. The remainder of the studies linked data on the level of individual patient (n = 13), primary care practice (n = 4), hospital (n = 1) or long-term care facility (n = 1). Two studies used two different levels of data linkage in their methods, namely patient level and either primary care level or long-term care facility level [9].
We identified different categories of AMR data linkage studies based on the data sources used for linkage. An overview of study characteristics and study aims, stratified by the identified categories, is presented in Table 1. Studies that linked data on antibiotic use and AMR (n = 9) mainly answered research questions regarding the association between the consumption of certain antibiotics and the prevalence of resistance to these antibiotics. Studies that linked data on population characteristics with data on antibiotic use and/or AMR (n = 30) aimed to evaluate the association between demographic, economic or governance factors and antibiotic use and AMR. Examples of these factors are gender, age, socio-economic status, education level, ethnicity, knowledge on antibiotic use, universal influenza immunization, access to drinking water, travel history, ambient temperature and cultural differences.
Data sources
Most included data linkage studies used two (n = 23) or three (n = 14) data sources. Other studies linked data from four (n = 7), five (n = 3), or more sources (n = 1). For the determinant AMR, antimicrobial susceptibility testing (AST) data was used most frequently as a database (n = 25). Another eleven studies that used AMR data, did not explicitly mention whether the database included individual test values or only aggregated numbers per entity. For the determinant antibiotic use, prescription data was the most common used data type (n = 13), but also antimicrobial sales data was used in several studies (n = 8). Additionally, insurance data and patient charts were used. Ten studies stated that they used antimicrobial consumption data. It is not clear how ‘consumption’ was measured, since this could not be extracted from the papers. Data on population characteristics was mostly obtained through demographic databases (n = 23) and population surveys (n = 9). In addition to existing data, some studies performed extra questionnaires. Other sources that were used contained data on institution characteristics or primary care practices.
Added value
Forty-three studies (90%) identified added values, aligning with the categories specified in our aim. Thirteen articles even described added values related to two categories. An overview of added values, stratified by different categories of AMR data linkage studies, is given in Table 2. It is noticed that there is quite some overlap in recommendations for clinical practice and implications for future policies. A distinction was made based on whether the recommendation was addressed to caregivers or policy makers.
In total, sixteen of the identified data linkage studies gave recommendations for clinical practice, such as taking into account certain patient characteristics and local conditions in AMS programs and antibiotic prescribing. Furthermore, a common recommendation was prudent antibiotic prescribing and the use of a different antibiotic as first-line treatment. Studies including population characteristics also often led to implications for guiding future policies, which were found in thirteen articles and many studies recommended to take population characteristics into account. Examples are increasing policy attention for specific regions, changing prescribing guidelines for certain groups, tailoring AMS campaigns to local context, and improving awareness of AMR in specific settings. Eighteen studies provided suggestions for further research in their discussion. The most common suggestion for further research was to update the study with more data, and data on patient characteristics that were not yet included or were only used as covariates in the model. Other suggestions were that other designs and individual-level studies should be used to confirm a causal relationship. Suggestions for surveillance (eight studies) were reported mostly in studies on AMR and population characteristics. Most studies emphasized the importance of surveillance data as being essential for developing risk management strategies, appropriate empirical treatment guidelines, regular analysis, evaluation of interventions and for early response of emerging trends.
Strengths and limitations of data linkage studies
Several strengths and limitations with regard to data linkage were identified in the studies. In twelve studies a strength of data linkage was explicitly mentioned and in 30 studies at least one barrier was explicitly mentioned. Strengths and limitations are summarized in Table 3.
Some authors mentioned that a strength of data linkage studies is that they are very useful for hypothesis generating and that they can be used as a pilot study before undertaking more resource intensive prospective research. In addition, analysis can be improved when more data become available. Merging data also gives the opportunity to study questions touching on several fields, for example regarding the impact of sociologic and economic factors on health-related factors. Furthermore, it was stated that more output can be achieved from national surveillance data without extra costs and time, and associations between AMR determinants can be monitored in a longitudinal manner.
Thirteen papers mentioned the problem of ecological fallacy (Table 3). Ecological fallacy occurs when characteristics of a group are attributed to an individual [55]. Authors of eleven articles mentioned unobserved confounding as a limitation, which means that unmeasured variables affect both the independent variable and the outcome. Data on topics such as AMS and IPC protocols is scarce, so those subjects are often not taken into account [20]. Other limitations were that completeness of data reporting is a problem when using routinely collected data, and sometimes data cannot be included because not all entities could be linked. Also, AST can be performed in different ways and there is variation in antimicrobial susceptibility between the countries, but still these data is combined.
Discussion
This systematic scoping review gives an overview of studies that linked AMR data and focuses on the yield and added value. Forty-eight AMR data linkage studies were identified. It was shown that data linkage studies allow researchers to integrate information from multiple sources to gain a more comprehensive understanding of AMR dynamics. Overall, the findings demonstrate that almost all studies (43/48) had added value and provided recommendations for clinical practice and future policies, or suggestions for further research or surveillance.
Identified AMR data linkage studies were divided into different categories based on the data sources that were used. The largest category consisted of studies linking AMR data to population characteristics. Population characteristics were also often linked to data on antibiotic use. Another large group linked AMR data to data on antibiotic use. To a lesser extent, AMR and/or antibiotic use data were linked to animal data, data on institutional characteristics or information on AMS. Types of data that were used most were AST data, prescription data, antimicrobial sales data and data from demographic databases. Fifteen studies linked data from different countries, and most of them linked data on a country level. Single-country studies mostly linked data on the regional level, but also on the level of healthcare facility or on individual patient level.
This review shows that there are only thirteen studies linking data on the level of the individual patient, indicating a notable gap in current research. The majority of included studies focused on linking data at a geographical level. Several factors can contribute to this predominance. For example, aggregated surveillance data are more often publicly available, standardized, and interoperable, while patient level data may be more restricted due to privacy concerns and often require additional approvals for use. Still, data linkage on patient level could be of added value, giving better insights into AMR dynamics than data linkage on an aggregated level. Therefore, there is a need for efforts directed towards better individual data access and management and overcoming legal hurdles complicating this type of research.
The added values of linkage studies differ across the identified categories. Studies involving patient characteristics more often lead to recommendations for clinical practice and implications for guiding future policies, while other categories more often lead to suggestions for further research. Recommendations for clinical practice often involve taking into account certain patient characteristics in AMS programs and antibiotic prescribing. Implications addressed to policy makers also frequently involve considering population characteristics and local and cultural context in campaigns, guideline development, and in targeting policy attention. Another added value of data linkage studies is that they can help in identifying risk factors associated with the development and spread of AMR as well as in assessing the effectiveness of interventions, since data on these factors is mostly captured in multiple databases. In addition, data linkage studies have proven to be very suitable for hypothesis generating. Because most data is already existing, data linkage studies can serve as preliminary investigation for further prospective research. Suggestions for further research are mostly already very specific. However, especially implications for policies and surveillance were often described as hints or suggestions.
AMR data linkage studies come with various limitations. For studies using AST data, combining data from different testing methods poses a challenge. Validation procedures are crucial to ensure data comparability. Another limitation is that studies had large data granularity and had no access to data at individual-level. Therefore, the majority of identified studies had ecological study designs, which are known for their difficulty in establishing causality [55, 56]. Moreover, ecological studies are very prone to ecological fallacy and unobserved confounding, which might affect the reliability and generalizability of findings, including recommendations for interventions targeting AMR. Despite these challenges, recommendations resulting from ecological data linkage studies can still be valuable and reliable if certain considerations are taken into account. First, researchers and policymakers should interpret findings with caution, recognizing the inherent limitations [56]. Ideally, recommendations from ecological studies should be supplemented with evidence from other study designs such as randomized controlled trials or cohort studies [57]. Also, researchers should conduct sensitivity analyses to assess the robustness of findings to potential biases [58]. Limitations that were identified in other medical data linkage studies not related to AMR are gaining and maintaining public trust for the use of data, reducing costs, and inefficiencies in how linked data are made available for research [59,60,61]. By considering and acknowledging the limitations, recommendations from both ecological and individual-level studies can still contribute to efforts to address AMR and improve public health outcomes.
Data linkage also has potential for public health related topics other than AMR. A recently published review described the use of linked data for infectious disease events and showed the variety of purposes the method can be used for [60]. The authors stated that data linkage is particularly useful for rare diseases affecting specific populations. Additionally, the World Health Organization published a report describing approaches to data linkage for evidence informed policy. It was mentioned that data linkage was used a lot during the COVID-19 pandemic and that the pandemic catalysed the secondary use of data [61]. Therefore, it would be interesting to look further into the lessons learned from COVID-19 data linkage research and apply them to AMR data linkage research. In both publications [60, 61], details on the method used for linkage, which was not covered in our review, were discussed. We initially aimed to gather more information on data linkage methods but found that the included articles offered limited details on this aspect. For AMR surveillance systems and other relevant data sources, more research should be performed to identify the practical methods for data linkage, for example ICT and governance possibilities.
This systematic scoping review has strengths and limitations. One of the strengths is the broad scope, which allowed us to include literature with different study designs, methodologies, and study outcomes. Therefore, this review provides an exhaustive overview of AMR data linkage studies. In addition, the process of a scoping review made it possible to use an inductive approach proceeding towards the added values of data linkage that were identified. However, several limitations also need to be acknowledged. First, the variability in terminology for data linkage, the lack of Medical Subject Headings and the absence of a general definition might have resulted in missing some relevant articles. However, we formulated a definition of data linkage to search for literature as uniform as possible. A second limitation is the absence of a formal risk of bias assessment. Scoping reviews map existing literature rather than assess outcomes, making a formal risk of bias assessment unnecessary. Moreover, traditional tools are often unsuitable for the diverse study designs and outcomes included. Lastly, some literature was older than five years, with the oldest study being published in 1998. Recommendations of newer studies might be more reliable due to better quality of surveillance data, advancements in ICT infrastructure, and incorporation of novel insights in methodologies. However, to answer our research question, we looked into the yield of the method of data linkage and were mostly interested in whether there is a yield and in what form.
Conclusion
This systematic scoping review shows that data linkage on the subject of AMR is increasingly performed in recent years. Data linkage studies mainly lead to new hypotheses for future research and contribute to the optimisation of surveillance systems and interpretation of data in the context of guideline/policy development. There are, however, some limitations regarding ecological designs and data accessibility that need to be acknowledged and taken into account in practical deliveries. This systematic scoping review implicates that data linkage in the field of AMR has potential to gain a more comprehensive understanding of AMR dynamics. Therefore, more studies using data linkage, considering lessons learnt from COVID-19 data linkage studies, should be performed to improve knowledge on methodological approaches, data access, data management, and governance issues.
Availability of data and materials
No datasets were generated or analysed during the current study.
Abbreviations
- AMR:
-
Antimicrobial resistance
- AMS:
-
Antimicrobial stewardship
- AST:
-
Antimicrobial susceptibility testing
- COVID-19:
-
Coronavirus disease 2019
- JIACRA:
-
Joint inter-agency antimicrobial consumption and resistance analysis
- NG-MAST:
-
Neisseria gonorrhoeae multi-antigen sequence typing
- PRISMA:
-
Preferred reporting items for systematic reviews and meta-analysis
- PRISMA-ScR:
-
Preferred reporting items for systematic reviews and meta-analysis extension for scoping reviews
- SGSS:
-
Second generation surveillance system
- UTI:
-
Urinary tract infection
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Acknowledgements
We thank Floor Boekelman for her assistance in developing, piloting, and further refining our search strategy.
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This research project is funded by the Dutch Ministry of Health, Welfare and Sport.
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SK, CW, AS, and AV contributed to the conceptualization of the scoping review and to defining data linking. SK and CW performed title and abstract screening. Discrepancies were solved by AS. SK, CW and AS were responsible for the final article selection for inclusion. SK performed the data charting, interpretation of the data and contributed most to drafting the manuscript. CW and AS verified the data charting. All authors (SK, CW, AS and AV) contributed to the revision of the manuscript and approved the final manuscript.
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van Kessel, S.A.M., Wielders, C.C.H., Schoffelen, A.F. et al. Enhancing antimicrobial resistance surveillance and research: a systematic scoping review on the possibilities, yield and methods of data linkage studies. Antimicrob Resist Infect Control 14, 25 (2025). https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s13756-025-01540-7
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DOI: https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s13756-025-01540-7