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Circulation of Anaplasma phagocytophilum among invasive and native carnivore species living in sympatry in Poland

Parasites & Vectors volume 16, Article number: 368 (2023) Cite this article

Abstract

Background

Anaplasma phagocytophilum is characterized by a worldwide distribution and distinguished from other Anaplasmataceae by the broadest range of mammalian hosts and high genetic diversity. The role carnivores play in the life cycle of A. phagocytophilum in Europe is uncertain. Currently, only the red fox is considered a suitable reservoir host. In this study, we focused on native and invasive medium-sized carnivore species that live in sympatry and represent the most abundant species of wild carnivores in Poland.

Methods

A total of 275 individual spleen samples from six carnivore species (Vulpes vulpes, Meles meles, Procyon lotor, Nyctereutes procyonoides and Martes spp.) were screened combining nested PCR and sequencing for A. phagocytophilum targeting a partial groEL gene with subsequent phylogenetic analysis inferred by the maximum likelihood method.

Results

The DNA of A. phagocytophilum was detected in 16 of 275 individuals (5.8%). Eight unique genetic variants of A. phagocytophilum were obtained. All detected haplotypes clustered in the clade representing European ecotype I. Three variants belonged to the subclade with European human cases together with strains from dogs, foxes, cats, and wild boars.

Conclusions

While carnivores might have a restricted role in the dissemination of A. phagocytophilum due to their relatively low to moderate infection rates, they hold significance as hosts for ticks. Consequently, they could contribute to the transmission of tick-borne infections to humans indirectly, primarily through tick infection. This underscores the potential risk of urbanization for the A. phagocytophilum life cycle, further emphasizing the need for comprehensive understanding of its ecological dynamics.

Graphical Abstract

Background

Anaplasma phagocytophilum is a gram-negative alpha-proteobacterium infecting neutrophils. It is characterized by a broad distribution [1, 2] and distinguished from other Anaplasmataceae bacteria by the widest range of mammalian hosts and high genetic diversity [3]. Based on studies focused on ecology and genetic diversity, the species of A. phagocytophilum consists of at least four major ecotypes, of which only ecotype I has been proven to infect humans in Europe so far [4, 5]. The main hosts of ecotype I are ungulates [6, 7], dogs, cats, horses [8,9,10], and various wild mammals in urban or suburban areas, such as red foxes (Vulpes vulpes) [11,12,13], hedgehogs (Erinaceus sp.) [14,15,16,17], and wild boars (Sus scrofa) [18,19,20]. European ecotype I of A. phagocytophilum is mainly transmitted by the tick Ixodes ricinus, characterized by low host specificity [21, 22]. To some extent, the nest-dwelling I. hexagonus, which is known to parasitize hedgehogs, red foxes, and European badgers, is involved in the circulation of ecotype I of A. phagocytophilum [23, 24]. Occasionally, species from other tick genera tested positive for the presence of A. phagocytophilum DNA; however, their significance is currently unknown [25,26,27,28].

In Europe, A. phagocytophilum has been detected by molecular methods in wild carnivores from six families: Canidae, Ursidae, Mustelidae (Caniformia), Felidae, Procyonidae, and Viverridae (Feliformia) [3, 29,30,31]. Although the role of wild carnivores as reservoir hosts for this pathogen in Europe is uncertain, some species such as raccoon dogs and red foxes are capable of transmitting A. phagocytophilum in nature. In this study, we focused on native and invasive medium-sized carnivore species living in sympatry and representing the most abundant species of wild carnivores in Poland. Thus, the objectives of this study were to understand the genetic diversity of A. phagocytophilum in wild invasive and native carnivores with overlapping ranges and to investigate the possibility of cross-species transmission of genetic variants (including zoonotic ones) of A. phagocytophilum between these species.

Materials and methods

Study area and sampling

The carcasses of red fox, raccoon dog, raccoon, badger, and marten were collected in the forestry of Ruszów (51° 24′ 00.1″ N 15° 10′ 12.2″ E) in the Lower Silesia County in Poland during the predator control, which was part of the program for the reintroduction of capercaillie (Tetrao urogallus) in the Lower Silesian Forest (project LIFE11 NAT /PL/428) in the years 2017–2019. All carcasses were frozen and transported to the Department of Parasitology, University of Wrocław. A total of 275 individual spleen samples from six carnivore species, red fox (V. vulpes) (n = 48), raccoon dog (Nyctereutes procyonoides) (n = 50), raccoon (Procyon lotor) (n = 42), badger (Meles meles) (n = 51), beech marten (Martes foina) (n = 57), and European pine marten (Martes martes) (n = 27) were collected during necropsy. All samples were kept at − 20 °C until further DNA isolation procedures.

DNA extraction, PCR protocols and sequencing

DNA was extracted from 10 mg of spleen using the commercial GeneMatrix Bio-Trace DNA Purification Kit (EURx, Poland) according to the manufacturer’s instructions. PCRs for detection of A. phagocytophilum were performed using 2 × PCRBIO Taq Mix Red (PCR Biosystems, UK). To determine the groEL ecotype of A. phagocytophilum, 1297 bp fragments of the groESL operon or (in the case of a missing amplicon) 407 bp of the groEL gene were amplified by nested PCR as previously described [18]. To distinguish two marten species (M. martes and M. foina) the rapid PCR–RFLP method described by Vercillo et al. [32] was used.

Amplicons were separated by electrophoresis in a 1.5% agarose gel stained with Midori Green Advance (Nippon Genetics Europe, Germany) gel stain and visualized under UV light. All PCR products of the expected size were excised from the agarose gels, purified, and sequenced in both directions using the amplification primers. Sequencing was performed by Macrogen Capillary Sequencing Services (Macrogen Europe, the Netherlands). The sequences obtained were processed using the Geneious 11.1.4 software [33] and compared with those available in the GenBank™ dataset by Basic Local Alignment Tool (BLAST).

Phylogenetic analysis

The phylogeny of A. phagocytophilum was constructed using eight unique groEL haplotypes detected in this study along with 65 sequences from GenBank, representing four ecotypes described by Jahfari et al. [4] and a sequence from Anaplasma platys used as outgroup. Due to unequal sequence lengths, the alignment was calculated in two steps using the MAFFT algorithm ‘Auto’ strategy for sequences > 1000 nt and the –add function for implementing sequences < 1000 nt in the alignment with final length of 1402 nt. The phylogenetic tree was inferred by the maximum likelihood method by IQTREE 1.6.5 [34]. The best-fit evolution model was selected based on the Bayesian information criterion (BIC) computed by implemented ModelFinder [35]. Branch supports were assessed by the ultrafast bootstrap (UFBoot) approximation [36] and by the SH-like approximate likelihood ratio test (SH-aLRT) [37]. Trees were visualized and edited in FigTree v1.4.1 and Inkscape 0.91.

Results

The DNA of A. phagocytophilum was detected in 16 of 275 individuals (5.8%). The number of positive animals per species ranged from one (2%) in raccoon dog to five (8.8%) in beech marten (Table 1). Three long (> 1000 nt) and 13 short (300–400 nt) sequences of the groEL gene representing 8 unique genetic variants were obtained. The major genetic variant V1 was detected in seven samples derived from four martens and a single European badger, red fox, and raccoon, respectively. Two other variants, V2 and V3, were detected in two animals each. Variant V2 was found in red fox and racoon dog, and variant V3 was detected in samples from red foxes only. The remaining variants V4–V8 were detected in one sample each from three martens, one badger, and one raccoon (Table 1). The representative sequences were submitted to the GenBank under the accession number OR167090-OR167101. In phylogenetic analyses (Fig. 1), all detected haplotypes clustered in the largest clade representing European ecotype I [4], which is closely related to isolates from the USA and forms cluster I [5]. Three variants (V1, V3, and V8) belonged to the subclade with European human cases and strains from dogs, foxes, cats, and wild boars. The remaining five variants were distributed among strains isolated from I. ricinus, European hares, carnivores, and sequences obtained from ungulates.

Table 1 The prevalence of Anaplasma phagocytophilum among invasive and native carnivore species living in sympatry in Poland
Full size table
Fig. 1
figure 1

A Schematic representation of the maximum likelihood phylogenetic tree based on the groEL gene sequences of Anaplasma phagocytophilum representing all ecotypes. The highlighted clade representing Ecotype I is displayed in detail; bootstrap values (SH-aLRT/UFB) above the 70/70 threshold are displayed; sequence of Anaplasma platys used as an outgroup is not shown. B Detailed view of the clade representing the Ecotype I/Cluster I; sequences acquired from the GenBank database are marked by their accession number, host, and country of origin. Sequences from this study are highlighted in red and marked by the number of a respective variant. The scale bar indicates the number of nucleotide substitutions per site. C Map of Poland with a detailed locality of Ruszów Forestry sampling area

Full size image

Discussion

The persistence and transmission of tick-borne pathogens in ecosystems relies upon abundance of susceptible reservoir hosts and their infestation by permissive tick species. Studies on European strains of A. phagocytophilum have shown that a wide range of animal species are involved in the circulation of this pathogen in different ecological niches [38]. Among all Anaplasma spp., A. phagocytophilum represents an assemblage with enormous genetic diversity. Clarifying which host species harbor specific strains of Anaplasma is important for understanding pathogen dynamics and for developing measures to reduce disease burden [39]. The role of carnivores in the ecoepidemiology of A. phagocytophilum is not well understood. While several wild carnivores have been implicated as possible reservoirs for A. phagocytophilum in the US, only the red fox has been considered a suitable host in Europe [12, 29, 30, 40,41,42]. Carnivores such as badgers and martens are often overlooked in studies. This information gap also affects invasive species such as raccoons and raccoon dogs, which were intentionally introduced to Europe and later spread through the continent [43]. In our study, we have shown that both native (foxes, badgers, martens) and invasive (raccoons) carnivores living in sympatry in a forest biotope are involved in the circulation of A. phagocytophilum with zoonotic potential, finding the genetic variant V1 in all examined species except raccoon dogs (Table 1, Fig. 1).

The red fox is the most widespread free-living predator in the world [44], and its role as a host for A. phagocytophilum is well documented [45, 46]. In Poland, A. phagocytophilum has been detected in foxes with prevalence ranging from 2.7% in the central part of the country [11] to 34.5% in the northeastern regions [31]. In our study, 6.2% of animals tested positive for this pathogen, which is consistent with the general trend observed for Anaplasma infections in the European fox population and supports foxes as a reservoir of A. phagocytophilum.

Only a few previous studies have focused on the role of mustelids in the circulation of A. phagocytophilum. In this study, 3.9% of badgers and 9.5% of martens were positive for A. phagocytophilum DNA. Analyses focused on badgers and martens from eastern and northern Poland detected the DNA of A. phagocytophilum in 18.7% and 41.7% of animals, respectively [31]. For comparison, the number of positive badgers from Spain and The Netherlands did not exceed 2% [39, 47]. Data on A. phagocytophilum in European marten populations are sparse. To our knowledge, this pathogen has been detected so far in a beech marten from Romania [28] and a pine marten from Hungary [45] in which ecotype I was recognized [4]. In addition, in mustelids from The Netherlands tested by quantitative polymerase chain reaction (qPCR) for several Tick Borne Pathogens (TBPs), A. phagocytophilum was detected in beech martens (1.5%), European badgers (1.8%), European polecats (Mustela putorius) (4.9%), and pine martens (22%) [39]. The observed discrepancies in overall prevalence are likely due to the specific environmental conditions under which each study was conducted, affecting tick occurrence and density. The type of tissue and molecular method used to detect pathogens may also explain the differences in results [17]. The results of our study indicate that martens are significantly more susceptible to Anaplasma infection, with a consistent increase in prevalence observed in these predators in all cited studies. The differences in distribution patterns between the two species (the pine marten has a patchy, fragmented ecogeographic distribution restricted to a narrow ecological niche, whereas the beech marten has a continuous distribution across a wide range of natural, semi-natural, and even urban habitats) may have implications for the ecoepidemiology of A. phagocytophilum, particularly in the context of rapid landscape change and intense urbanization processes. Nevertheless, the current lack of comprehensive studies makes it difficult to fully elucidate the relationships. Determining whether martens have exclusive host/reservoir competence for Anaplasma, Anaplasmataceae, or other tick-borne pathogens is a complex task that requires further investigation. Invasive carnivore species, such as raccoons and raccoon dogs, are potential reservoirs for numerous TBPs [43, 48], and we also found A. phagocytophilum in 2% of raccoon dogs and 4.7% of raccoon dogs. The prevalence of A. phagocytophilum previously observed in raccoon dogs from Poland (35.3%) [31] was higher than in Germany (23%) [47]. Kjær and colleagues reported a high clustering of A. phagocytophilum-positive ticks on individual raccoon dogs in Denmark [49]. Raccoons from Austria, the Czech Republic, Germany, and Poland [50, 51] were tested for the presence of A. phagocytophilum DNA, but the pathogen was found in only one raccoon from the latest study [43]. Our results show that raccoons are adapted to carry European variants of A. phagocytophilum. Due to their synanthropic nature and frequent use of tree holes and burrows of other animal species, raccoons can be infested with both questing and endophilic ticks, potentially bridging the enzootic cycles of A. phagocytophilum. Regarding the epidemiological impact of raccoons and raccoon dogs, these invasive species should be monitored for their possible involvement in the spread of A. phagocytophilum in different geographic regions [51].

In recent years, awareness of role of wildlife in TBPs and the possible impact on livestock, humans, and their pets has increased [52]. Knowledge of potential reservoir hosts and their ticks is necessary to develop effective surveillance and management measures for disease outbreaks and parasite cycles in wildlife [53]. Nidicolous ticks such as Ixodes hexagonus, which are commonly found on foxes and have been detected on mustelids [39, 54], deserve future attention as they may play a role as vectors for zoonotic variants of A. phagocytophilum. In addition, high population densities of predator populations are possible in European landscapes with heterogeneous habitat structure, leading to shared territories among red foxes, raccoons, and raccoon dogs [55,56,57], favoring the transmission of vectors and pathogens. The increasing distribution and numbers of foxes in urban and suburban areas make this species a bridging species between natural ecosystems and anthropogenic landscapes [39].

Conclusions

While carnivores might have a restricted role in the dissemination of A. phagocytophilum due to their relatively low to moderate infection rates, they hold significance as hosts for ticks. Consequently, they could contribute to the transmission of tick-borne infections to humans indirectly, primarily through tick infection. This underscores the potential risk of urbanization for the A. phagocytophilum life cycle, further emphasizing the need for comprehensive understanding and management of its ecological dynamics.

Data availability

Data will be made available on request.

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Acknowledgements

The carnivores’ carcasses were collected during the predator control operation conducted as a part of the program to re-introduce the capercaillie (Tetrao urogallus) in the Lower Silesian Forest financed by the European Commission, the National Fund for Environmental Protection and Water Management, and the Polish State Forests (Grant LIFE11 NAT/PL/428). We are grateful to Janusz Kobielski and Marcin Popiołek, PhD, DSc, for their help in collecting the material. We thank Weronika Hildebrand, DVM, for help with laboratory work.

Funding

KH was supported by the project National Institute of Virology and Bacteriology (Programme EXCELES, ID Project No. LX22NPO5103)—Funded by the European Union—Next Generation EU.

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Authors and Affiliations

  1. Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic

    Paulina Maria Lesiczka & David Modrý

  2. Department of Parasitology, Faculty of Biological Sciences, University of Wrocław, Wrocław, Poland

    Izabella Myśliwy, Katarzyna Buńkowska-Gawlik, Joanna Hildebrand & Agnieszka Perec-Matysiak

  3. Biology Centre, Institute of Parasitology, Czech Academy of Sciences, České Budějovice, Czech Republic

    David Modrý

  4. Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic

    David Modrý

  5. Faculty of Medicine in Pilsen, Biomedical Center, Pilsen, Czech Republic

    Kristýna Hrazdilová

  6. Department of Chemistry and Biochemistry, Mendel University, Brno, Czech Republic

    Kristýna Hrazdilová

Authors
  1. Paulina Maria Lesiczka
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  2. Izabella Myśliwy
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  7. Agnieszka Perec-Matysiak
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Contributions

PL, KH: methodology; PL, IM: formal analysis; KH, JH, APM: funding acquisition: PL, KH: original draft writing; all authors were responsible for editing and review; all authors approved the version to be submitted.

Corresponding author

Correspondence to Paulina Maria Lesiczka.

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The approval of the Ethics Committee was not required because the material for the research was obtained from the predator control operation.

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The authors declare no conflict of interest.

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Lesiczka, P.M., Myśliwy, I., Buńkowska-Gawlik, K. et al. Circulation of Anaplasma phagocytophilum among invasive and native carnivore species living in sympatry in Poland. Parasites Vectors 16, 368 (2023). https://doi.org/10.1186/s13071-023-05996-7

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Keywords

Parasites & Vectors

ISSN: 1756-3305

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