Ticks on wild boar in the metropolitan area of Barcelona (Spain) are infected with spotted fever group rickettsiae

Castillo‐Contreras, R ORCID: https://orcid.org/0000-0002-5770-7264, Magen, L, Birtles, RJ ORCID: https://orcid.org/0000-0002-4216-5044, Varela‐Castro, L, Hall, JL, Conejero, C ORCID: https://orcid.org/0000-0001-6830-6880, Aguilar, XF, Colom‐Cadena, A ORCID: https://orcid.org/0000-0003-0983-2412, Lavín, S, Mentaberre, G ORCID: https://orcid.org/0000-0001-9542-7514 and López‐Olvera, JR ORCID: https://orcid.org/0000-0002-2999-3451 2021, 'Ticks on wild boar in the metropolitan area of Barcelona (Spain) are infected with spotted fever group rickettsiae' , Transboundary and Emerging Diseases, 69 (4) .

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Tick‐borne pathogens (TBPs) constitute an emerging public health concern favoured by multidimensional global changes. Amongst these, increase and spread of wild boar (Sus scrofa) populations are of special concern since this species can act as a reservoir of zoonotic pathogens and promote tick abundance. Thus, we aimed to make a first assessment of the risk by TBPs resulting from wild boar and ticks in the vicinity of a highly populated area. Between 2014 and 2016, we collected spleen samples and 2256 ticks from 261 wild boars (out of 438 inspected) in the metropolitan area of Barcelona (MAB; northeast Spain). We morphologically identified four tick species: Hyalomma lusitanicum (infestation prevalence: 33.6%), Dermacentor marginatus (26.9%), Rhipicephalus sanguineus sensu lato (18.9%) and R. bursa (0.2%). Ticks were pooled according to species and individual host. A total of 180 tick pools and 167 spleen samples were screened by real‐time PCR and/or reverse line blot hybridization assay for Ehrlichia sp., Anaplasma sp., Babesia sp., Rickettsia sp., Borrelia burgdorferi sensu lato and Coxiella burnetii. Seventy‐two out of the 180 tick pools were positive to Rickettsia spp. (minimum prevalence of 8.7%), including Rickettsia massiliae, R. slovaca and R. raoultii. We did not detect Rickettsia spp. in wild boar spleens nor other TBPs in ticks or wild boars. Since the ticks identified can bite humans, and the recorded spotted fever group (SFG) rickettsiae are zoonotic pathogens, there is a risk of SFG rickettsiae transmission for MAB inhabitants. Our results suggest a broader distribution of H. lusitanicum, competent vector for the Crimean‐Congo haemorrhagic fever virus than previously known. Wild boar is not a Rickettsia spp. reservoir according to the spleen negative results. However, its abundance could favour tick life cycle and abundance, and its proximity to humans could promote the infection risk by Rickettsia spp.

Item Type: Article
Additional Information: ** Article version: VoR ** From Wiley via Jisc Publications Router ** Licence for VoR version of this article: http://creativecommons.org/licenses/by-nc-nd/4.0/ **Journal IDs: issn 1865-1674; issn 1865-1682 **Article IDs: publisher-id: tbed14268 **History: published 11-08-2021; accepted 28-07-2021; submitted 23-12-2020
Schools: Schools > School of Environment and Life Sciences
Journal or Publication Title: Transboundary and Emerging Diseases
Publisher: Wiley
ISSN: 1865-1674
Related URLs:
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 12 Aug 2021 08:39
Last Modified: 17 Aug 2022 08:02
URI: https://usir.salford.ac.uk/id/eprint/61484

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