On the possible role of ticks in the eco-epidemiology of Coxiella burnetii in a Mediterranean ecosystem.
Ruminant livestock is the main reservoir of Coxiella burnetii (Cb), but little is known about the role of wildlife and ticks in its epidemiology. The Iberian ibex (Capra pyrenaica, Schinz 1838) population of "Ports de Tortosa i Beseit" (NE Spain) suffers intense tick infestations and low reproduction rates. This study aims to (1) assess the relationship between infection in ibexes (detection of serum antibodies and/or of Cb DNA in tissues) and Cb DNA presence in ticks hosted by the same ibexes; and (2) identify Cb associated risk factors. Between 2011 and 2015, serum (n = 130), spleen (n = 72), lymph node (n = 89) and tick (n = 669) samples from 134 hunter-harvested ibexes were collected. Antibody detection was performed by ELISA and Cb DNA presence was assessed by PCR. Potential risk factors were assessed with regression tree models. Although 30% of the ibexes (39/130; 95%CI, [10%-29.8%]) had antibodies, Cb DNA was detected in only 9.8% of the ibexes (11/112; 95%CI [7.6%-27.25%]). The prevalence of Cb-carrier ticks averaged 10% and exceeded 20% for the genus Haemaphysalis. However, lacking correlation between infection in ibexes and their ticks does not support tick-to-ibex transmission or vice versa. Tree modelling points to host, population and environmental factors as drivers of Cb infection in ticks and suggests connections with the domestic cycle. The percentage of Cb-carrier ticks detected is noteworthy. Along with heavy tick infestations, it suggests vector potential for these tick species, especially for the genera Rhipicephalus and Haemaphysalis. Since vector competence has not been assessed in these tick species, a classic vector role cannot be proposed nor discarded, but promoter factors of vector capacity occur. In addition, the risk of tick-borne infection through tick excreta should not be neglected. While the airborne route is the preeminent route for Cb infection, ticks' contribution to Cb epidemiology deserves further attention.
['Varela-Castro|Lucía|L|', 'Zuddas|Carla|C|', 'Ortega|Nieves|N|', 'Serrano|Emmanuel|E|', 'Salinas|Jesús|J|', 'Castellà|Joaquim|J|', 'Castillo-Contreras|Raquel|R|', 'Carvalho|João|J|', 'Lavín|Santiago|S|', 'Mentaberre|Gregorio|G|']
D000818:Animals D000829:Animals, Domestic D000835:Animals, Wild D000907:Antibodies, Bacterial D016997:Coxiella burnetii D017753:Ecosystem D006041:Goats D006801:Humans D058751:Livestock D008198:Lymph Nodes D015995:Prevalence D011778:Q Fever D012307:Risk Factors D013030:Spain D013154:Spleen D013984:Tick Infestations D017282:Tick-Borne Diseases D013987:Ticks
Coxiella burnetii Capra pyrenaica Haemaphysalis punctata Q fever Tick-borne diseases