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Evidence collection5 July 2023

Brucella canis

Evidence-based veterinary medicineOne HealthSmall animals

Published 5 July 2023 | Updated 31 October 2025

Update

There have been a number of recent updates regarding the increasing serological diagnosis of Brucella canis and its public health implications.

The first is a review article, written by a group of authors, including those working for The World Organisation for Animal Health (WOAH) as well as the European Union and national reference laboratories for Brucellosis.

Djokic, V. et al. (2023) The emergence of Brucella canis as a public health threat in Europe: what we know, and what we need to learn. Emerging Microbes & Infections, 12 (2), no.2249126. https://doi.org/10.1080/22221751.2023.2249126

We have provided a summary of this paper.

There have also been a number of updates from the UK Government including an update of Human Animal Infections and Risk Surveillance group (HAIRS) risk assessment for Brucella canis and updated versions of the APHA summary information sheet for veterinary staff and Frequently Asked Questions, which includes updated information on the interpretation of test results, including positive predictive values for a range of possible prevalence rates.

Introduction

Brucella canis was first detected following an outbreak of abortion in a beagle colony in the United States in the 1960s. Since then, it has become widespread and has been reported in North, Central and South America, and parts of Asia, Africa and Europe. There have been recent reports of increasing case numbers in a number of countries, often associated with imported dogs.

The aim of this evidence collection is to bring together recently published literature and links to other resources which will provide veterinary professionals with up-to-date evidence on which to base their clinical decisions and advice.

Brucella canis has now been made a reportable disease in the UK, therefore we have included links to advise from the UK government, but we have also included links to resources from other countries that may have useful experience to share in dealing with this disease.

Guidance

This section provides links to useful review articles and guidance documents.

UK guidance

Guidance from other countries

Zoonotic potential / public health

Brucellosis is a common zoonosis worldwide, with five out of the nine known Brucella species known to be able to infect humans. The most pathogenic and invasive species for human is B. melitensis, followed in descending order by B. suisB. abortus and B. canis.

While B. canis is a recognised zoonotic pathogen, the number of human cases reported globally is small. This section provides links to current reviews of Brucellosis as a zoonosis before looking at more specific evidence relating to the zoonotic potential of B canis.

Brucellosis

Brucella canis

Clinical cases

This section provides links to papers reporting clinical cases and outbreaks of Brucella canis infection in dogs.

Pathological findings

Disease control

Diagnostic tests

The diagnosis of canine brucellosis is acknowledged to be difficult and is likely to require the combination of results from a number of different methods. In interpreting the results of any test. it is important to be aware of the limitations of the test methodology and the effect of disease prevalence on the predictive value of the results. It is also important to be aware that new tests are being developed and to check with individual laboratories regarding the details of the exact tests that they are using.

This section provides references to a selection of papers on different test methodologies and  the understanding and interpretation of test results.

Understanding and interpreting diagnostic test

Infection with other strains of brucella

Although in the UK concerns have cantered around the risk of introduction of Brucella canis, it is worth being aware that in Australia there has been concern about cases of B suis in dogs, especially those involved in hunting or eating feral pigs.

Brucellosis in other animals

About evidence collections

Evidence collections bring together collections of published papers on topics of interest and importance to the veterinary professions. Papers are chosen for relevance and accessibility, with the full text of articles either being available through the RCVS Knowledge library, on open access or from other publications to which a significant number of veterinary professionals are likely to have access. This means that there may be relevant evidence that is not included.

If you would like assistance in searching for further evidence on this topic you may find the following helpful EBVM Toolkit 2: Finding the best available evidence.

If you would like to suggest a paper for inclusion in one of our published evidence collections, or a topic for a future collection, please email library@rcvsknowledge.org

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