<i>Rickettsia helvetica</i>in<i>Dermacentor reticulatus</i>Ticks

Dobec, Marinko; Golubić, Dragutin; Punda‐Polić, Volga; Kaeppeli, Franz; Sievers, Martin

doi:10.3201/eid1501.080815

Cited by 59 publications

(47 citation statements)

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“…autumn and spring), in which period this tick species is usually sampled for the detection of rickettsiae (e.g. Dobec et al, 2009). Thus, relevant prevalence rates from single-habitat sampling should be interpreted with caution.…”

Section: Resultsmentioning

confidence: 99%

“…However, to the best of the authors' knowledge, most (if not all) of these studies are based on the molecular analysis of ticks collected in a limited part of the questing period (e.g. Dobec et al, 2009;Reye et al, 2013), not taking into account potential seasonal variations in the rate of infection with tick-borne rickettsiae, or not mentioning seasonal data at all (Wójcik-Fatla et al, 2013). The objective of this study was to provide an example, in which it is shown that for a more accurate determination of the prevalence rates of D. reticulatus-borne rickettsiae it is inevitable to include samples from the whole tick season.…”

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confidence: 99%

“…Among other zoonotic pathogens, D. reticulatus is known to be a carrier and/or vector of several Rickettsia spp., including R. raoultii, R. slovaca (Spitalská et al, 2012) and R. helvetica (Dobec et al, 2009).…”

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confidence: 99%

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Seasonally biased or single-habitat sampling is not informative on the real prevalence of Dermacentor reticulatus-borne rickettsiae — A pilot study

Hornok

Meli

Gönczi

et al. 2017

Acta Veterinaria Hungarica

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Dermacentor reticulatus is a tick species of high medical and veterinary importance, emerging in several parts of Europe. Up to now most studies focusing on zoonotic rickettsiae in D. reticulatus were based on ticks collected in a limited part of the questing period, and did not take into account the potential seasonal variations in the rate of infection with tick-borne rickettsiae. The aim of the present study was to investigate the latter phenomenon, i.e. to screen D. reticulatus adults, collected monthly in two urban habitats of Budapest, for the presence of three zoonotic Rickettsia spp. Altogether 852 D. reticulatus adults were collected, which showed significantly similar seasonal activity in the two evaluated habitats. Among the 413 molecularly analysed ticks, R. helvetica-infected D. reticulatus were only collected during autumn in habitat-1, in contrast to habitat-2. The overall prevalence of R. raoultii in D. reticulatus adults was significantly higher in habitat-1 than in habitat-2. In addition, the seasonal distribution of R. raoultiiinfected ticks was different between the two habitats (in habitat-2 significantly more R. raoultii-infected ticks were collected in the autumn, in comparison with winter and spring). Rickettsia slovaca was not detected in any of the molecularly analysed ticks. The results clearly indicate that a single-time or seasonally biased collection of D. reticulatus adults and their subsequent molecular analysis may not be informative on the real prevalence of rickettsiae. This is because the availability/activity of infected ticks shows significant seasonal fluctuations, both within and between habitats. Instead, for screening D. reticulatus-borne rickettsiae, it is important to collect monthly samples and then to assess seasonal prevalence and actual habitat-associated eco-epidemiological risks.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Seasonally biased or single-habitat sampling is not informative on the real prevalence of Dermacentor reticulatus-borne rickettsiae — A pilot study

Hornok

Meli

Gönczi

et al. 2017

Acta Veterinaria Hungarica

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“…9). These bacteria have been found in Dermacentor marginatus and Dermacentor reticulatus ticks in a great majority of European countries, with a high percentage of ticks infected with these bacteria (208,(280)(281)(282)(283)(284)(285)(286)(287)(288)(289)(290). Dermacentor ticks usually bite hairy domestic and wild animals (291).…”

Section: Tick-borne Rickettsiae In Europe Species Identified As Pathomentioning

confidence: 99%

Update on Tick-Borne Rickettsioses around the World: a Geographic Approach

et al. 2013

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SUMMARY Tick-borne rickettsioses are caused by obligate intracellular bacteria belonging to the spotted fever group of the genus Rickettsia . These zoonoses are among the oldest known vector-borne diseases. However, in the past 25 years, the scope and importance of the recognized tick-associated rickettsial pathogens have increased dramatically, making this complex of diseases an ideal paradigm for the understanding of emerging and reemerging infections. Several species of tick-borne rickettsiae that were considered nonpathogenic for decades are now associated with human infections, and novel Rickettsia species of undetermined pathogenicity continue to be detected in or isolated from ticks around the world. This remarkable expansion of information has been driven largely by the use of molecular techniques that have facilitated the identification of novel and previously recognized rickettsiae in ticks. New approaches, such as swabbing of eschars to obtain material to be tested by PCR, have emerged in recent years and have played a role in describing emerging tick-borne rickettsioses. Here, we present the current knowledge on tick-borne rickettsiae and rickettsioses using a geographic approach toward the epidemiology of these diseases.

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“…It has been generally accepted that I. ricinus is the main vector of R. helvetica. However, D. reticulatus ticks were found to be infected with R. helvetica in Croatia (Dobec et al, 2009). Serosurveys have found antibodies reactive to R. helvetica in 1.9%-12.5% of the population and PCR positive cases were confirmed in France (Davoust et al, 2012), Italy (Corrain et al, 2012, Austria (Sonnleitner et al, 2012), Poland (Chmielewski et al, 2011) andSweden (Nilsson et al, 2010).…”

Section: Rickettsia Helveticamentioning

confidence: 99%

Update on Rickettsioses in Slovakia

Sekeyová¹,

Socolovschi²,

Špitalská³

et al. 2013

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Summary. -The reported incidence of vector-borne diseases including various cases of Rickettsioses in humans is increasing due to a combination of climatic and social factors, escalating the opportunities for contact between people and ticks, fleas or lice. Many of the emerging infectious diseases currently challenging human health in Europe are transmitted by ticks which normally feed on domestic or wild animals. Each Rickettsia spp. has one or several tick vectors, and their geographical distribution varies according to geographical conditions; e.g.; altitude or temperature, which is gradually changing due to a global warming. Evidence of Rickettsia spp. particularly of a newly discovered species is a strong indication that a great number of diseases may be caused by so far undetected or unrecognized organisms. Their diagnosis relies mostly on rare "spot like" cooperation of clinicians with scientists, the members of the working groups that are devoted to the scientific studies of the corresponding research areas. The clinical picture of the disease caused by rickettsiae varies significantly from flu like symptoms to severe fatal outcomes, reflecting the various factors, e.g. a variability of virulence of rickettsial species due to cell invasion, dissemination of rickettsiae, genomics, immune response of an infected organism, or a tricky impact of a treatment. Several major reviews on rickettsioses have been previously published, e.g. in 1997(Parola et al., 2005, and in 2011 (Botelho-Nevers and Raoult, 2011). In this work we intend to present a short historical overview and to describe new trends in research studies of rickettsiology. The main focus will be on rickettsioses affecting Europe΄s population.

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Rickettsia helveticainDermacentor reticulatusTicks

Cited by 59 publications

References 13 publications

Seasonally biased or single-habitat sampling is not informative on the real prevalence of Dermacentor reticulatus-borne rickettsiae — A pilot study

Seasonally biased or single-habitat sampling is not informative on the real prevalence of Dermacentor reticulatus-borne rickettsiae — A pilot study

Update on Tick-Borne Rickettsioses around the World: a Geographic Approach

Update on Rickettsioses in Slovakia

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