Diagnosis and incidence risk of clinical canine monocytic ehrlichiosis under field conditions in Southern Europe

Particle and Fibre Toxicology

Lénaïg Halos²  Luc Chabanne⁴  David Abrial³  Christian Ducrot³  Karine Chalvet-Monfray¹  Stefania Badavelli²  Ana Leal²  Marta Leon²  Raphaël Massot⁴  Jeanne Chêne⁴  Isabelle Lebert³  Magalie René-Martellet³ 

[1] VetAgro Sup campus vétérinaire de Lyon, 1 avenue Bourgelat, Marcy l’Etoile, 69280, France;Merial S.A.S, 29 avenue Tony Garnier, Lyon, 69007, France;INRA, UR 346 Epidémiologie Animale, Saint-Genès-Champanelle, 63122, France;Université de Lyon, VetAgro Sup Campus vétérinaire de Lyon, Jeune équipe Hémopathogènes vectorisés, 1 avenue Bourgelat, Marcy L’Etoile, 69280, France

关键词: Incidence risk;    Dog;    Vector-borne diseases;    Italy;    Portugal;    Spain;    Clinical canine monocytic ehrlichiosis;    Ehrlichia canis;   

Others  :  1148183
DOI  :  10.1186/s13071-014-0613-4

 received in 2014-10-01, accepted in 2014-12-18,  发布年份 2015

【 摘 要 】

Background

Canine Monocytic Ehrlichiosis (CME), due to the bacterium Ehrlichia canis and transmitted by the brown dog tick Rhipicephalus sanguineus, is a major tick-borne disease in southern Europe. In this area, infections with other vector-borne pathogens (VBP) are also described and result in similar clinical expression. The aim of the present study was to evaluate the incidence risk of clinical CME in those endemic areas and to assess the potential involvement of other VBP in the occurrence of clinical and/or biological signs evocative of the disease.

Methods

The study was conducted from April to November 2011 in veterinary clinics across Italy, Spain and Portugal. Sick animals were included when fitting at least three clinical and/or biological criteria compatible with ehrlichiosis. Serological tests (SNAP®4Dx, SNAP®Leish tests, Idexx, USA) and diagnostic PCR for E. canis, Anaplasma platys, Anaplasma phagocytophilum, Babesia spp, Hepatozoon canis and Leishmania infantum detection were performed to identify the etiological agents. Ehrlichiosis was considered when three clinical and/or biological suggestive signs were associated with at least one positive paraclinical test (serology or PCR). The annual incidence risk was calculated and data were geo-referenced for map construction. The probabilities of CME and other vector-borne diseases when facing clinical and/or biological signs suggestive of CME were then evaluated.

Results

A total of 366 dogs from 78 veterinary clinics were enrolled in the survey. Among them, 99 (27%) were confirmed CME cases, which allowed an estimation of the average annual incidence risk of CME amongst the investigated dog population to be 0.08%. Maps showed an increasing gradient of CME incidence risk from northern towards southern areas, in particular in Italy. It also suggested the existence of hot-spots of infections by VBP in Portugal. In addition, the detection of other VBP in the samples was common and the study demonstrated that a dog with clinical signs evocative of CME is as likely to be positive to Ehrlichia canis as to another VBP.

Conclusions

The study confirms the endemicity of CME in southern Europe and highlights the difficulties encountered by veterinarians to differentiate CME from other vector-borne diseases under field conditions.

【 授权许可】

   
2015 René-Martellet et al.; licensee BioMed Central.

【 图 表 】

Figure 1.

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