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Babesia vesperuginis, a neglected piroplasmid: new host and geographical records, and phylogenetic relations



Babesia spp. are hemoparasites which infect the red blood cells of a large variety of mammals. In bats, the only known species of the genus is Babesia vesperuginis. However, except a few old reports, the host range and geographical distribution of this bat parasite have been poorly studied. This study aimed to investigate the presence of piroplasms in tissues of bats collected in four different countries from eastern and central Europe: Austria, Czech Republic, Hungary and Romania.


A total of 461 bat carcasses (24 species) were collected between 2001 and 2016 from caves, mines and buildings. PCR was performed using specific primers targeting a portion of the 18S rDNA nuclear gene and cytochrome c oxidase subunit 1 mitochondrial gene, followed by sequencing.


The results of this study show for the first time the presence of B. vesperuginis in bats in central and eastern Europe. The phylogenetic analysis of the 18S rDNA nuclear gene revealed no variability between the sequences and the phylogenetic analysis of the cox1 mitochondrial gene proved that B. vesperuginis could be divided into two subclades.


Our study showed a broad geographical distribution of B. vesperuginis in European bats, reporting its presence in five new host species (M. cf. alcathoe, M. bechsteinii, M. myotis, Pi. nathusii and V. murinus) and three new countries.


Chiroptera is the second largest order of mammals and includes about 20% of all mammal species worldwide [1]. Studies on the epidemiological role of chiropterans in the transmission of pathogens have focused mainly on zoonotic viruses such as rabies [2, 3], acute respiratory syndrome (SARS) [4], Ebola [5], Zika [6], and other viral disease (influenza, acute respiratory illness, chikungunya) [7]. Compared with other mammals, the role of bats in the transmission cycle of tick-borne protists [8, 9] and bacteria are less studied [10, 11]. The life-cycle of most of the Babesia spp. in domestic animals is well known and involves a hard tick as a definitive host [12]. However, for bat piroplasms, the life-cycle (including a complete range of the vertebrate hosts) and the vectors involved are unknown.

Babesia vesperuginis was described by Dionisi [13] from Nyctalus noctula in Italy and later found also in Pipistrellus sp. in Italy [14]. The species was later reported in the UK [15] in blood smears of bats, followed by experimental transmission studies [16]. Concannon et al. [17] identified the infection with B. vesperuginis by PCR targeting the 18S rDNA in six individuals from a total of 60 bats from Cornwall, UK, and they concluded that the parasite is different from other known Babesia. The only study outside Europe reports the presence of unidentified Babesia in Mormoops megalophylla from Colombia, with a low microscopic prevalence of 1.19% in blood smears [18]. In general, the diversity and ecology of bat piroplasmids remains unknown, and there is no data regarding how the parasite is transmitted. Hornok et al. [8] studied the presence of apicomplexan protozoans in bat faeces from Hungary and Romania. All samples were tested for the presence of piroplasms DNA with a conventional PCR and the positive samples (2.25%) have shown similarity with Babesia canis.

The aim of this study was to investigate the presence of piroplasmids and their genetic diversity in bats from central and eastern Europe, namely from Austria, Czech Republic, Hungary and Romania based on partial sequences of nuclear 18S rRNA and mitochondrial cox1 genes to broaden the knowledge on their host spectrum, geographical distribution and phylogenetic relationships to other piroplasms.


Heart tissue from 461 bats collected in four different countries (Austria, Czech Republic, Hungary and Romania) between 2001 and 2016 were examined (Additional file 1: Table S1, Fig. 1). All animals were found either as accidental kills of wind power generators, dead due to natural causes or euthanized because of progressive deterioration of general condition (in few captive specimens). A wind farm in Babadag, Romania, consisting of 20 turbines was monitored for a period of four years (2013–2016) using a weekly time frame with two consecutive days of carcass searches, from April to November. Bat carcases were found either fresh or desiccated. Samples were collected from carcasses which have been labelled fresh. These have been found on the second day of each weekly field visit and presented no signs of maggots or decomposition. All bats were identified according to morphological keys [19] and stored in 96% ethanol, at -80 °C (samples from Austria) or in a freezer until their necropsy. Morphological identification of whiskered bats from the Myotis mystacinus group (M. alcathoe, M. brandtii and M. mystacinus) is not only problematic, but these species may show signs of hybridization [20]. Therefore, we distinguished these as the ‘most likely’ morphological species (e.g. Myotis cf. alcathoe in case of a bat identified morphologically as M. alcathoe). Genomic DNA was extracted from 25 mg of heart tissue using DNeasy Blood & Tissue Kit (Qiagen, Hilden, Germany), according to the manufacturer’s instruction and stored at -20 °C.

Fig. 1
figure 1

Sampling sites: red dots represent the positive locations for Babesia vesperuginis; black dots represent the negative locations (including multiple samples from the same place). Abbreviations: AT, Austria; CZ, Czech Republic; HU, Hungary; RO, Romania

A nested PCR targeting a 561 bp fragment of 18S rDNA using previously described primers [21, 22] was used for initial screening. The reactions were carried out in a 25 μl reaction mixture containing 12.5 μl 2× Green PCR Master Mix (Rovalab GmBH, Teltow, Germany), 5.5 μl water, 1 μl of each primer (10 pmol/ μl) and 5 μl aliquot of isolated DNA in the first round and in the second round instead of DNA 2 μl of PCR product from the first round was used. The PCR was performed using the T1000™ Thermal Cycler (Bio-Rad, London, UK) with the following condition: initial denaturation at 95 °C for 3 min, then 40 cycles of denaturation at 95 °C for 30 s, annealing at 60 °C for 30 s (for the first round), 50 °C for 30 s (for the second round) and extension at 72 °C for 1 min (for the first round), 72 °C for 40 s (for the second round) and a final extension at 72 °C for 7 min. For each set of reactions (45 samples) 2 negative controls (distilled water) and one positive control which was DNA isolated from the blood of a naturally infected dog with Babesia canis were included.

For the samples positive for 18S rDNA, an additional nPCR targeting the cox1 gene was applied using a modified protocol described by Gou et al. [23] with the following primers Bab_For1: (5′-ATW GGA TTY TAT ATG AGT AT-3′), Bab_Rev1: (5′-ATA ATC WGG WAT YCT CCT TGG-3′) for the first round and Bab_For2: (5′-TCT CTW CAT GGW TTA ATT ATG ATA T-3′), Bab_Rev2: (5′-TAG CTC CAA TTG AHA RWA CAA AGT G-3′) for the second round. The amplification was performed as follows: 25 μl reaction mixture containing 2 μl aliquot of isolated DNA in the first round and 1 μl in the second, 12.5 μl Master Mix (PCRBIO Taq Mix Red), 1 μl of each primer (10 pmol/μl) and 8.5 μl water. The amplification profile consisted of 1 min of initial denaturation at 95 °C, followed by 35 cycles of denaturation at 95 °C for 15 s, annealing at 45 °C for 30 s (for the first round), 49 °C for 30 s (for the second round) and extension at 72 °C for 1 min, and a final extension at 72 °C for 10 min.

Amplification products were visualized by electrophoresis on 1.5% agarose gel stained with RedSafe™ 20,000× Nucleic Acid Staining Solution (Chembio, St Albans, UK), and their molecular weight was assessed by comparison to a molecular marker (O’GeneRuler ™ 100 bp DNA Ladder, Thermo Fisher Scientific Inc., Waltham, MA, USA). PCR products were purified using the QIAquick PCR purification kit (Qiagen, Hilden, Germany) and sent for sequencing (Macrogen Europe, Amsterdam, Netherlands).

The sequences were compared with those available in GenBank™ using Basic Local Alignments Tool (BLAST) analyses. All sequences were analysed and edited using Geneious® 9.1.2 software [24]. Alignments of non-coding (18S rDNA) sequences were generated using the ClustalW algorithm [25]. For coding cox1 sequences, translational alignment (nucleotide sequences are translated into protein, the alignment was performed on the protein sequence, and then translated back to nucleotide sequence) implemented in Geneious ® 9.1.2 using ClustalW algorithm was performed. The evolution model for each dataset was chosen based on likelihood ratio test computed by R software (R Core Team, 2012). Phylogenetic analyses were performed using the maximum likelihood method in PhyML 3.0 software [26]. Phylogenetic trees were visualized and edited in FigTree v1.4.1 (

Statistical analysis was performed using EpiInfo™ 7 software (CDC, USA). The overall prevalence of B. vesperuginis, the prevalence at locality level and the prevalence of each bat species and their 95% confidence interval (95% CI) were calculated. The map was generated using ArcGIS 10.3 software (Fig. 1).


PCR targeting 18S rDNA revealed the presence of piroplasmid DNA in 20 out of 461 bats (4.34%, 95% CI: 2.83–6.61). The positive samples originated from 9 different locations from three different countries, belonging to seven bat species (Tables 1 and 2). Babesia vesperuginis was present in Myotis cf. alcathoe (1/12), M. bechsteinii (1/4), M. myotis (1/6), N. noctula (4/246), P. nathusii (3/28), P. pipistrellus (6/71) and Vespertilio murinus (4/23). The following species were negative (numbers of examined specimens in parentheses): Barbastella barbastellus (n = 2), Eptesicus nilssonii (n = 1), E. serotinus (n = 6), Hypsugo savii (n = 11), Miniopterus schreibersii (n = 4), M. cf. brandtii (n = 3), M. daubentonii (n = 1), M. cf. mystacinus (n = 4), M. nattereri (n = 1), N. leisleri (n = 5), Pi. kuhlii (n = 8), Pi. pygmaeus (n = 5), Pl. auritus (n = 8), Pl. austriacus (n = 1), Rhinolophus euryale (n = 9), R. ferrumequinum (n = 1) and R. hipposideros (n = 1).

Table 1 Prevalence (%) and frequency (in parentheses) of Babesia vesperuginis in the positive bat species in each locality
Table 2 Samples from the phylogenetic analysis of 18S rRNA nuclear gene (GenBank Accesion numbers provided) and cox1 mitochondrial gene

BLAST analysis of the 18S rDNA sequences from the 20 positive samples showed a 96 to 100% similarity to B. vesperuginis (GenBank: AJ871610.1) isolated from Pipistrellus sp. in the UK. All sequences obtained from bat tissues were highly similar, except a single one from a M. myotis sample (GenBank: MG011464) (Peştera cu Apă din Valea Leşului, Romania), which differed by two nucleotides (Fig. 2). All sequences were submitted to the GenBank database under the accession numbers MG011454–MG011473.

Fig. 2
figure 2

Phylogenetic tree constructed by maximum likelihood method on nucleotide sequences of 18S rRNA gene (fragment of 515 nt) of piroplasmid clade VI according to Schnittger et al. [27]. Details for sequences generated in the present study (host species and country of sample origin) are provided in Table 2. Proportion from 1000 replicates of bootsrap values only above 75% are displayed. Theileria parva sequences were used as the outgroup

Additional cox1 PCR applied to all 18S rDNA positive samples showed a lower success of amplification (17/20). No cox1 sequences were available from B. vesperuginis in GenBank for comparative analysis. The BLAST analysis of all 17 cox1 sequences showed maximum 78% similarity with different isolates of Babesia and Theileria. Based on these data, a broad phylogenetic analysis including also the most related Theileria spp. cox1 sequences (clade no. V, according to Schnittger et al. [27]) was performed to confirm the phylogenetic relationships of B. vesperuginis with a broader range of piroplasmids (data not shown in our tree). Our B. vesperuginis cox1 sequences remained in a basal position within the Babesia clade VI, thus confirming the 18S rDNA based phylogeny. From the 17 cox1 sequences, 14 were similar amongst each other, forming a subclade with identity above 99.65% (maximum difference of 3 nt within 864 nt used for the phylogeny) and three of them forming a separate subclade of almost identical sequences (1 nt difference in sequence with the accession number MF996541). The subclades differ by 15–19 nt (within 861 nt fragments) among each other (Fig. 3). All sequences were submitted to the GenBank database under the accession numbers: MF996533–MF996549.

Fig. 3
figure 3

Phylogenetic tree constructed by maximum likelihood method on translational alignment of nucleotide sequence of coding region of cox1 gene (fragment 861 nt) of piroplasmid clade VI according to Schnittger et al. [27]. Details for sequences generated in the present study (host species and country of sample origin) are provided in Table 2. Proportion from 1000 replicates of bootsrap values only above 75% are displayed. Theileria spp. sequences were used as the outgroup


The samples collected for the present study originated from 24 bat species from three families including the Miniopteridae, Rhinolophidae and Vespertilionidae. All the positive animals belonged to five different genera of the Vespertilionidae. As the number of examined specimens from the other two families was low, we do not feel confident in establishing or refuting their host status for B. vesperuginis. Except for N. noctula and Pi. pipistrellus [13,14,15,16,17], all other bat species (M. cf. alcathoe, M. bechsteinii, M. myotis, Pi. nathusii and V. murinus) are new host records for B. vesperuginis. Our study shows for the first time the presence of B. vesperuginis in tissues of bats from Austria, Czech Republic and Romania.

Hornok et al. [8] found Babesia spp. in faeces of insectivorous bats and suggested as a likely way of infection the food ingested by bats [8]. All positive bat species forage over a range of habitats including deciduous forests, woodland edge, wetland, pasture [19]. The food of most of the positive species consists of small insects like moths [28, 29], mosquitoes [30, 31] and small dipterans [19]. The prey is caught during flight (M. alcathoe, Pi. nathusii, Pi. pipistrellus, V. murinus) or picked up from various surfaces (M. bechsteinii). There are two exceptions: N. noctula feeds on medium sized insects (dipterans, beetles, caddis flies) during flight and M. myotis feeds from the ground, on beetles, large moths, crickets and spiders [19]. By selecting food in such varied habitat types, bats may encounter the (yet) unknown vector for B. vesperuginis.

Another hypothesis regarding the vector of B. vesperuginis was presented by Gardner et al. [17] suggesting that a bat specific soft tick (Argas vespertilionis) may be the vector for this piroplasm species. While we did not find any soft ticks on the bats analysed, these animals might have been parasitized before at their roosts. As only larvae of soft ticks spend longer time on their hosts, their presence is hard to be detected [32, 33].

The roosting sites of sampled species are in tree hollows, buildings, cracks in cliffs or caves for the summer and underground habitats, caves for the winter except V. murinus which hibernates in rock fissures and crevices in tall buildings [19]. All species usually form mixed colonies with congeneric species (e.g. M. bechsteinii with M. daubentonii). In other cases, roosts may contain mixed colonies, with species from different genera (e.g. M. myotis with Rhinolophus spp.). In hibernating sites, even species which roost in trees may encounter a wide variety of ectoparasites, including soft ticks. Some species are sedentary (M. alcathoe, M. bechsteinii, Pi. pipistrellus) [19], others are adapted to migration over a few hundred kilometres (M. myotis) [19] and others migrate for long-distance, up to 2000 km (N. noctula, Pi. nathusii, V. murinus) [19, 34]. Long distance migrants feed on the go, fuelling their energy loss while migrating [34]. The range of species studied and their diverse ecology showed that B. vesperuginis has a wide geographical distribution among different bat populations; it can be spread over a long distance and has low bat host specificity. Most of the bat species that were negative for the presence of B. vesperuginis are sedentary, except Mi. schreibersii and N. leisleri. However, in most of the cases, the negativity of certain bat species for B. vesperuginis might have been a consequence of the small sample size.

Gardner et al. [15] found B. vesperuginis in two species: Pi. pipistrellus (19/206, 9.22%) and M. mystacinus (1/11, 9.09%) in UK. Concannon et al. [17] examined by PCR (targeting 18S rDNA) the heart tissue of bats and found B. vesperuginis only in Pipistrellus sp. (6/60, 10%) in the UK. All records of B. vesperuginis, including the present study, indicate that the main host species for B. vesperuginis in Europe are N. noctula and Pipistrellus spp.

The phylogenetic analysis of the 20 18S rDNA sequences showed no variability between them. However, when the more variable cox1 gene was used, the phylogeny demonstrated the presence of a widely distributed clade (five host species, eight localities from Austria, Czech Republic and Romania) and a smaller one, with two host species (N. noctula and Pi. nathusii). In two localities (Babadag and Huda lui Papară, Romania), sequences included in both subclades of the cox1 tree were present.

The life-cycle of B. vesperuginis is unknown. Gardener et al. [15] suggested the involvement of Argas vespertilionis as a vector, as this soft tick was found on the majority of the Pi. pipistrellus bats infected with B. vesperuginis. Similarly, only soft ticks (Ornithodoros marinkellei and Antricola mexicanus) were found on Mormoops megalophylla bats infected with Babesia sp. in Colombia [19]. However, the presence of B. vesperuginis has never been tested in soft ticks of bats. Moreover, for nearly all the Babesia species with a known life-cycle, the vector is a hard tick [35], suggesting a close co-evolution of piroplasms with the family Ixodidae. Nevertheless, Babesia meri is transmitted by Ornithodoros erraticus to the fat sand rat (Psammomys obesus) [36]. In addition, circumstantial evidence indicates the possible role of O. moubata (Argasidae) in the transmission of B. gibsoni in dogs after being artificially infected with this parasite [37], showing that the involvement of a soft tick in the life-cycle of Babesia sp. is possible. All hard ticks identified (a few individuals) on the individual bats included in the present study were examined and proved negative for the presence of B. vesperuginis in a different study [9].


Our study showed a broad geographical distribution of B. vesperuginis in European bats, reporting its presence in five new host species (My. cf. alcathoe, My. bechsteinii, My. myotis, Pi. nathusii, V. murinus). The low variability of 18S rDNA and cox1 sequences and a large number of confirmed host species suggest low host specificity of this piroplasmid and imply the involvement of a rather ubiquitous vector.


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We are grateful for the help of our collaborators during field work and sample collection: Lucie Dufková, Daniel Ruzek, Péter Estók, Sándor Boldogh, Irina Pocora, Viorel Pocora, Teodor Dan Ursache and to Cristian Domşa for the distribution map.


This research was supported from grants TE 36/2015 and TE 298/2015, by projects of The Ministry of Education, Youth and Sports of the Czech Republic CEITEC 2020 (LQ1601), COST CZ LD14048, project LO1218 with financial support from the Ministry of Education, Youth and Sports of the Czech Republic under the NPU I programme. We acknowledge a grant for the development of research organization (RVO: RO0516). This paper was prepared under the frame of EurNegVec COST Action TD1303.

Availability of data and materials

The data supporting the conclusion of this article are provided within the article and its additional file. Sequences are submitted to the GenBank database under the accession numbers MG011454–MG011473 (18S rDNA) and MF996533–MF996549 (cox1).

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AC, DM and ADM wrote the manuscript. ADS, LB, DȘM, IC, SH, ZB and KS collected the material for the study. ADS, DȘM, IC, SH, NL, ZB and KS helped in the identification of bat species. AC, IAM, AMI and MAC did the necropsies, AC and KH performed laboratory work and analysis of the data. ADS, IAM, AMI, SH and HPF participated in manuscript correction. All authors read and approved the final manuscript.

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Correspondence to Alexandra Corduneanu.

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Additional file 1:

Table S1. Samples distribution according to species and locality. (XLSX 15 kb)

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Corduneanu, A., Hrazdilová, K., Sándor, A.D. et al. Babesia vesperuginis, a neglected piroplasmid: new host and geographical records, and phylogenetic relations. Parasites Vectors 10, 598 (2017).

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