General Aspects of Antibacterial Resistance Surveillance Hajo Grundmann University Medical Centre Groningen ReAct – Action on Antibiotic Resistance

Topics Surveillance: general considerations The three levels of ABR surveillance Threats to validity and solutions

General considerations

Definition: Surveillance ‘ The ongoing systematic collection, analysis of health data essential to the planning, implementation, and evaluation, of public health practice, … Alexander Langmuir 1963

The ecological landscapes of AMR surveillance Patients Antibiotic Exposure Microbiota

The Nemesis of good surveillance in Antibiotic resistance Ambition Perfection Conflicting demands

The Demands: who defines them? Stakeholders Individuals who are directly affected Individuals who indirectly suffer from the repercussions of adverse health care outcomes caused by ABR Individuals who have a professional, corporate or altruistic responsibility

The three levels of ABR surveillance macro meta micro patient population pathogen

Patient level surveillance

Objective Optimising empirical antibiotic therapy Scale and Scope Local (single institution), timely, syndrome-based, inclusive Metric (operational unit of surveillance) Proportion resistance per infection and antibiotic compound based on the resistance among the causative pathogens (stratified by ethological fraction) see drug effectiveness index Ciccolini et al. JAC (2014)

Population level surveillance

Objective Estimating the size of ABR as a national and international public health problem Scale and Scope laboratory-based passive surveillance at selected sentinel sites using routinely available data Metric (operational unit of surveillance) Proportion resistance per indicator pathogen and antibiotic class for primary bacterial isolates (SPY criteria) from defined anatomical sites

EARSS Laboratories 1587 Hospitals >100 million citizens 33 countries

EARSS- database

EARSS- database

Pathogen level surveillance

Objective Identifying the orgin, emergence and transmission of bacterial pathogens and their high risk clones (HiRiCs) Scale and Scope laboratory-based genomic analysis of bacterial isolates Metric (operational unit of surveillance) measure of the genetic distance between any two bacterial isolates determined by high resolution genomic analysis

Threats to validity and solutions

Representativeness How many sites do you need to include to determine ABR at national level? Data quality How do you make sure that you could trust the data?

How many sites do you need to include ?

The HCU network

The “greedy” network Ciccolini et al, PNAS (2014)

How do you make sure that you can trust the data? Sentinel laboratories must adhere to agreed laboratory protocols incl. quality control, use agreed clinical susceptibility breakpoints (CLSI or EUCAST) have in place an acceptable laboratory information management system (WHO-NET) have a dedicated data manager participate in national/international quality assessment schemes (EQA)

How do you make sure that you can trust the data? ask every sentinel laboratory to perform whole genome sequencing on all indicator isolates! S. aureus AST results against Gold Standard in single laboratory

Thanks UMCG Mariano Ciccolini Tjibbe Donker ECDC Liselotte Hornberg Diaz Ole Heuer Sanger Centre Matt Holden David Aanensen EUCAST Development Laboratory,Växjö, Sweden Jenny Ahmann Erika Matuscheck Gunnar Kahlmeter United Kingdom Clinical Research Collaboration (UK CRC)