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SERVAL

A generic SuRveillance EVALuation framework for animal health surveillance systems

Animal health surveillance engages animal keepers, veterinarians in practice and elsewhere, laboratory scientists and decision makers in Government and Industry. Public and private investment is made in surveillance in order to obtain evidence for action to mitigate threats to animal and public health. This investment yields benefits for animal owners and for industries including food and leisure that depend upon a healthy animal population.

Animal health surveillance programmes may change in response to altering requirements or perceived weaknesses. However, they are seldom subjected to any formal evaluation to ensure that they provide valuable information in an efficient manner. Literature on the evaluation of animal health surveillance systems is sparse and those that are published may be unstructured and therefore incomplete (Drewe et al 2012).

To address this gap, we have developed SERVAL, a SuRveillance EVALuation framework, which is novel and aims to be generic and therefore suitable for the evaluation of any animal health surveillance system.

The SERVAL framework is organised in an easy-to-follow table format containing five sections each with detailed guidance notes and examples to assist the evaluator:

  1. Define the scope of the evaluation
  2. Characterise the surveillance system to be evaluated
  3. Design the evaluation
  4. Conduct the evaluation
  5. Reporting and communication

For more detailed information on the development and use of the SERVAL framework, please see:

  • Drewe, J.A., Hoinville, L.J., Cook, A.J.C., Floyd, T., Gunn, G. and Stärk, K.D.C. (2013) SERVAL: A new framework for the evaluation of animal health surveillance. Transboundary and Emerging Diseases DOI: 10.1111/tbed.12063

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Key features of SERVAL

  • Themes within each section are cross-referenced to avoid duplication of information and to enable the findings of the evaluation to be easily made into recommendations for improvements.
  • Guidance notes are provided in the appendix to the document on the definition and assessment of each of the surveillance system attributes. The inclusion of socio-economic criteria ensures that economic evaluation is an integral part of this framework.
  • Worked examples from several case studies encompassing different surveillance and evaluation objectives are included to demonstrate the use and utility of the framework.

SERVAL is based on a conceptual model that can be applied to any surveillance system. A set of 22 system attributes are defined and guidelines to their qualitative and/or quantitative assessment are provided. These have been compiled into an evaluation toolset that can be employed in a wide range of situations from specific surveillance system components – such as serological surveys – through to complete surveillance systems – such as early warning surveillance for new or re-emerging animal health threats.

Whilst the SERVAL framework was developed in the context of animal health surveillance in Britain, it is expected to be adaptable to most diseases and contexts and therefore of value to users in many situations. Feedback on the framework, definitions and guidance notes are welcome: please email Julian Drewe (jdrewe@rvc.ac.uk)

The SERVAL framework was developed in collaboration between the Royal Veterinary College (RVC), Animal Health and Veterinary Laboratories Agency (AHVLA) and the Scottish Agricultural College (SAC), with funding and support from the Department for Environment, Food and Rural Affairs (Defra).

Reference

Drewe, J.A., Hoinville, L.J., Cook, A.J.C., Floyd, T. and Stärk, K.D.C. (2012) Evaluations of animal and public health surveillance systems: a systematic review. Epidemiology and Infection 140: 575-590.

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