The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Alexandr A. Stekolnikov - One of the best experts on this subject based on the ideXlab platform.
-
contribution to the taxonomy of human infesting chiggers acariformes trombiculidae in europe
Systematic & Applied Acarology, 2021Co-Authors: Alexandr A. Stekolnikov, Kosta Y MumcuogluAbstract:Three species of chigger mites, which are supposed to be agents of human trombiculiasis in Europe, have been studied based on museum collections and specimens collected by the authors. Trombicula toldti Winkler, 1953 has been transferred to the monotypic genus Blanciella Vercammen-Grandjean, 1960. The type species of this genus, Blanciella deschiensi (Vercammen-Grandjean, 1956), was synonymized with Blanciella toldti comb. nov., and B. toldti was re-described. Lectotype of B. toldti was designated based on the type material donated to Zoological Institute RAS (St. Petersburg, Russia). The lectotype of Kepkatrombicula desaleri (Methlagl, 1928) was found in Museum National d’Histoire Naturelle (Paris, France), and the previously designated neotype of K. desaleri has been set aside. Both B. toldti and K. desaleri have been recorded for the first time in Switzerland infesting goats (Capra hircus L., 1758). Human parasitism by Neotrombicula inopinata (Oudemans, 1909) in the UK has been confirmed for the first time with an examined museum specimen.
-
contributions to the fauna of chigger mites acariformes trombiculidae of iran
Zootaxa, 2020Co-Authors: Mohsen Shamsi, Alexandr A. Stekolnikov, Alireza Saboori, Masoud Hakimitabar, Azadeh Zahedi GolpayeganiAbstract:Chigger mites of northern Iran were studied on the basis of field collections from rodent hosts. Thirty-five species were recorded. Two new species, Cheladonta afshari Stekolnikov and Shamsi sp. nov., collected on Apodemus sp. in Guilan and Mazandaran Provinces, and Neotrombicula tehranensis Stekolnikov and Shamsi sp. nov., collected on Cricetulus migratorius and Chionomys sp. in Tehran Province, are described. One new synonym is established: Neotrombicula vernalis (Willmann, 1942) (= Neotrombicula kermani Kudryashova, 1977 syn. nov.). Seventeen species were recorded in Iran for the first time; thus, the number of known Iranian chiggers constitutes 104. The record of Neotrombicula autumnalis (Shaw, 1790) in Iran is important from the veterinarian and medical points of view, as this species attacks humans and domestic animals.
-
The First Record of a Chigger Mite of the Genus Neotrombicula (Acariformes: Trombiculidae) in the Northwest of European Russia
Entomological Review, 2018Co-Authors: Alexandr A. Stekolnikov, K. A. TretyakovAbstract:A chigger mite species, Neotrombicula absoluta Schluger, 1966, previously known only from its type locality in Transcarpathian Region of Ukraine, was found in the vicinity of Kurgolovo Village (Kingisepp District, Leningrad Province, Russia). A single specimen of this species was collected off the common shrew Sorex araneus L. This is the first record of the genus Neotrombicula (which includes the most usual causative agents of trombiculiasis of humans and domestic animals in Europe) in the northwestern part of European Russia.
-
Phylogenetic tree of all currently available coi gene sequences of morphotyped trombiculid mites (n = 52 new; n = 25 from GenBank).
2018Co-Authors: Rawadee Kumlert, Alexandr A. Stekolnikov, Kittipong Chaisiri, Tippawan Anantatat, Serge Morand, Anchana Prasartvit, Benjamin L. Makepeace, Sungsit Sungvornyothin, Daniel H. ParisAbstract:This study provided 52 new coi gene sequences (marked by *, approx. 640 bp length) from Lao PDR (n = 47), Thailand (n = 4), Cambodia (n = 1), and included all available coi sequences from NCBI (n = 25). The phylogenetic tree constructed from these coi gene sequences demonstrated distinct grouping of assigned morphotypes at the genus levels. Although evidence of both genetic and morphological plasticity was found and sample sizes for each species were small, there was preliminary evidence of sub-structuring of chigger populations below the species level. Different branch colors indicate morphological classification of Trombiculidae [25]; blue = Walchia, purple = Neotrombicula, green = Ascoschoengastia, yellow = Schoutedenichia, orange = Schoengastia, pink = Blankaartia, red = Leptotrombidium. Black branch represents sequences of house dust mites (out group). This indicated that DNA extracted from specimens used for autofluorescence analysis was of sufficient quality for downstream PCR amplification.
-
Chigger mites of the genus Ericotrombidium (Acariformes: Trombiculidae) attacking pets in Europe
Veterinary Parasitology, 2016Co-Authors: Alexandr A. Stekolnikov, Helga Waap, Jacinto Gomes, Tânia AntunesAbstract:Abstract Diversity of chigger mites causing trombiculiasis of domestic animals and humans in Europe is greatly underestimated. A number of reports on the attacks of “harvest mite” (Neotrombicula autumnalis) could be based on misidentified chiggers from other species and genera. In this study descriptions of two cases of trombiculiasis are presented, which constitute the first report on the pets’ parasitism by the chigger genus Ericotrombidium in Europe. The species Ericotrombidium ibericense is for the first time reported in Portugal as a causative agent of the trombiculiasis entailed extensive alopecic lesions and pruritus in a cat. Ericotrombidium geloti is for the first time reported as a cause of canine trombiculiasis in Crimea. Presence of other Ericotrombidium species on man and domestic animals is highly probable in countries of the Mediterranean basin.
E-hyun Shin - One of the best experts on this subject based on the ideXlab platform.
-
RESEARCH ARTICLE Coincidence between Geographical Distribution of Leptotrombidium scutellare and Scrub Typhus Incidence in South Korea
2016Co-Authors: Jong Yul Roh, Wook-gyo Lee, Chan Park, Eun Hee Shin, Won Il Park, Bong Gu Song, Kyu-sik Chang, Hee Il Lee, Mi-yeoun Park, E-hyun ShinAbstract:To clarify the geographical distribution of scrub typhus vectors in Korea, a survey of larval trombiculid mites was conducted from 2005 to 2007 by collecting wild small mammals twice a year (spring and autumn) at 24 sites nationwide. A total of 67,325 mites representing 4 genera and 14 species were collected from 783 trapped rodents, corresponding to a chigger index (number of chigger mites per rodent) of 86.0. The predominant mite species were Leptotrombidium pallidum (52.6%), Leptotrombiduim scutellare (27.1%), Leptotrombidium palpale (8.2%), Leptotrombidium orientale (5.6%), and Neotrombicula tamiyai (1.7%). However, the proportions of L. scutellare in southern areas, including endemic provinces such as Jeollabuk-Do (34.3%), Jeollanam-Do (49.0%), and Gyeongsangnam-Do (88%), were relatively higher than in central Korean regions where L. pallidum was predominant. In autumn, the ratio of L. scutellare increased to 42 % while the ratio of L. pallidum decreased. The geographical distribution map of the L. scutellare chigger index was identical to the incidence pattern of scrub typhus, whereas thos
-
Coincidence between geographical distribution of Leptotrombidium scutellare and scrub typhus incidence in South Korea
PloS one, 2014Co-Authors: Jong Yul Roh, Wook-gyo Lee, Chan Park, Eun Hee Shin, Won Il Park, Bong Gu Song, Kyu-sik Chang, Hee Il Lee, Mi-yeoun Park, E-hyun ShinAbstract:To clarify the geographical distribution of scrub typhus vectors in Korea, a survey of larval trombiculid mites was conducted from 2005 to 2007 by collecting wild small mammals twice a year (spring and autumn) at 24 sites nationwide. A total of 67,325 mites representing 4 genera and 14 species were collected from 783 trapped rodents, corresponding to a chigger index (number of chigger mites per rodent) of 86.0. The predominant mite species were Leptotrombidium pallidum (52.6%), Leptotrombiduim scutellare (27.1%), Leptotrombidium palpale (8.2%), Leptotrombidium orientale (5.6%), and Neotrombicula tamiyai (1.7%). However, the proportions of L. scutellare in southern areas, including endemic provinces such as Jeollabuk-Do (34.3%), Jeollanam-Do (49.0%), and Gyeongsangnam-Do (88%), were relatively higher than in central Korean regions where L. pallidum was predominant. In autumn, the ratio of L. scutellare increased to 42% while the ratio of L. pallidum decreased. The geographical distribution map of the L. scutellare chigger index was identical to the incidence pattern of scrub typhus, whereas those of overall mites and L. pallidum showed no relationship with case incidence patterns. Distribution mapping analysis shows an identical geographical distribution of L. scutellare and epidemic incidence of scrub typhus in South Korea. L. pallidum could be another vector at all other parts of the Korean peninsula, including the eastern and northern regions that have a low level of scrub typhus incidence.
-
detection of orientia tsutsugamushi the causative agent of scrub typhus in a novel mite species eushoengastia koreaensis in korea
Vector-borne and Zoonotic Diseases, 2011Co-Authors: Hee Il Lee, Chan Park, Bong Gu Song, Mi-yeoun Park, Soo Kyoung Shim, Eun Na Choi, Kyu Jam Hwang, E-hyun ShinAbstract:Abstract To identify potential vector species of scrub typhus in the Republic of Korea (ROK), chigger mites were harvested from wild rodents captured at nine localities in October 2005. The bodies of the chigger mites were individually punctured with a fine pin, squeezed out internal contents, and examined for Orientia tsutsugamushi DNA by nested polymerase chain reaction. The exoskeleton of associated chiggers was mounted on glass slides with polyvinylalcohol (PVA) medium for identification. Among 830 individuals belonging to 4 genera and 14 species, O. tsutsugamushi was detected from 22 chiggers of six species, with an overall infection rate of 2.7%. The infection rate was highest for Leptotrombidium palpale (5.3%), followed by Neotrombicula japonica (4.3%), Leptotrombidium scutellare (3.7%), Leptotrombidium orientale (3.6%), Eushoengastia koreaensis (1.9%), and Leptotrombidium pallidum (1.5%). This study first reported O. tsutsugamushi infection from N. japonica and E. koreaensis larvae in the ROK. The...
M J Gracia Salinas - One of the best experts on this subject based on the ideXlab platform.
-
Severe Trombiculiasis in Hunting Dogs Infested With Neotrombicula inopinata (Acari: Trombiculidae)
Journal of Medical Entomology, 2019Co-Authors: M Areso Apesteguía, J B Areso Portell, N Halaihel Kassab, M J Gracia SalinasAbstract:This study records the clinical findings in nine hunting dogs showing systemic illness associated with trombiculids and identifies the mite species involved. In fall, coinciding with the seasonality of mites, all dogs were infested with mites and had been in the risk area (Sierra Cebollera Natural Park, La Rioja, Spain) a few hours before the onset of symptoms. The symptoms included vomiting, anorexia, weakness and lethargy, diarrhea, and even stupor. The clinical picture was fast-acting and potentially fatal. The infestations varied from low to severe. Molecular analysis of mites that fed on the dogs confirmed that they were larvae of Neotrombicula inopinata (Oudemans, Acari, Trombiculidae). This is the first time that N. inopinata has been identified as feeding on dogs and implicated in canine systemic illness associated with trombiculids. In contrast to other chiggers, N. inopinata does not seem to cause dermatitis. Likewise, the clinical and epidemiological similarity between the clinical symptoms we describe herein and the occurrence of seasonal canine illness (SCI) led us to suspect that this illness may be caused by infestation with these mites. The condition could be the consequence of severe infestation from large numbers of feeding mites, especially N. inopinata. Whether or not the cases were due to a severe allergic host response to salivary proteins or the result of the transmission of a new or emerging trombiculid-borne pathogen is not known.
Luis Cardoso - One of the best experts on this subject based on the ideXlab platform.
-
first report of Neotrombicula inopinata infestation in domestic cats from portugal
Veterinary Parasitology, 2019Co-Authors: David W Ramilo, Carla Monteiro, Marrion Carreira, Isabel Pereira Da Fonseca, Luis CardosoAbstract:Abstract Trombiculids parasitize a wide variety of terrestrial vertebrates, including domestic animals, throughout the world. They are parasites only during their larval stages, causing several dermatological lesions on their hosts, such as acute dermatitis, erythema, excoriation, erosion, papules, crusts and alopecia on the ear margins, face, interdigital spaces and abdomen. Neotrombicula is one of the several genera in Trombiculidae family, which cause trombiculosis. The most common species implicated in clinical cases is Neotrombicula autumnalis. However, several reports have shown that Neotrombicula inopinata (Oudemans, 1909) can also play a role in trombiculosis. Here, we describe the first case of N. inopinata infestation in domestic cats from mainland Portugal. Since nucleic acids of Anaplasma phagocytophilum and Borrelia burgdorferi have been found in Neotrombicula autumnalis and Rickettsia spp. in Neotrombicula inopinata, a correct taxonomical identification is essential to understand the role of these mite species as possible vectors of pathogens.
Stephanie S Godfrey - One of the best experts on this subject based on the ideXlab platform.
-
ecology and dynamics of the blood parasite hepatozoon tuatarae apicomplexa in tuatara sphenodon punctatus on stephens island new zealand
Journal of Wildlife Diseases, 2011Co-Authors: Stephanie S Godfrey, Michael C BullAbstract:We explored infection patterns and temporal dynamics of the protozoan blood parasite Hepatozoon tuatarae (Apicomplexa) infecting the tuatara (Sphenodon punctatus), a protected reptile living on Stephens Island, New Zealand. In March 2006, we surveyed tuatara in five study sites to examine spatial variation in infection prevalence, and four times, from May 2005 to November 2006, we recaptured marked individuals within three study sites to examine the temporal dynamics of infection. We also examined how blood-parasite infection patterns were influenced by host sex, body size, and host infestation with ticks (Amblyomma sphenodonti) and mites (Neotrombicula spp.), which are potential vectors of the blood parasite. Infection prevalence (16.9–24% infected) and intensity (< 0.01–0.1% blood cells infected) were low in all samples. Infection intensity varied among the five sampled sites in March 2006, but prevalence did not. Neither infection prevalence nor intensity varied with time, and infections were detected ...
-
social network structure and parasite infection patterns in a territorial reptile the tuatara sphenodon punctatus
International Journal for Parasitology, 2010Co-Authors: Stephanie S Godfrey, Jennifer A Moore, Michael C BullAbstract:We investigated whether the parasite load of an individual could be predicted by its position in a social network. Specifically, we derived social networks in a solitary, territorial reptile (the tuatara, Sphenodon punctatus), with links based on the sharing of space, not necessarily synchronously, in overlapping territories. Tuatara are infected by ectoparasitic ticks (Amblyomma sphenodonti), mites (Neotrombicula spp.) and a blood parasite (Hepatozoon tuatarae) which is transmitted by the tick. We recorded the location of individual tuatara in two study plots twice daily during the mating season (March) in 2 years (2006 and 2007) on Stephens Island, New Zealand. We constructed weighted, directed networks to represent pathways for parasite transmission, where nodes represented individual tuatara and edges connecting the nodes represented the extent of territory overlap among each pair of individuals. We considered a network-based hypothesis which predicted that the in-strength of individuals (the sum of edge weights directed towards a node) in the derived network would be positively related to their parasite load. Alternatively, if the derived social network did not reflect actual parasite transmission, we predicted other factors such as host sex, size or territory size may better explain variation in parasite infection patterns. We found clear positive relationships between the in-strength of tuatara and their tick loads, and infection patterns with tick-borne blood parasites. In particular, the extent that individuals were connected to males in the network consistently predicted tick loads of tuatara. However, mite loads of tuatara were significantly related to host sex, body size and territory size, and showed little association with network measures. The results suggest that the pathway of transmission of parasites through a population will depend on the transmission mechanism of the parasite, but that social networks provide a powerful predictive tool for some parasites.
-
seasonal and spatial dynamics of ectoparasite infestation of a threatened reptile the tuatara sphenodon punctatus
Medical and Veterinary Entomology, 2008Co-Authors: Stephanie S Godfrey, Christopher BullAbstract:: The conservation of threatened vertebrate species and their threatened parasites requires an understanding of the factors influencing their distribution and dynamics. This is particularly important for species maintained in conservation reserves at high densities, where increased contact among hosts could lead to increased rates of parasitism. The tuatara (Sphenodon punctatus) (Reptilia: Sphenodontia) is a threatened reptile that persists at high densities in forests (approximately 2700 tuatara/ha) and lower densities in pastures and shrubland (< 200 tuatara/ha) on Stephens Island, New Zealand. We investigated the lifecycles and seasonal dynamics of infestation of two ectoparasites (the tuatara tick, Amblyomma sphenodonti, and trombiculid mites, Neotrombicula sp.) in a mark-recapture study in three forest study plots from November 2004 to March 2007, and compared infestation levels among habitat types in March 2006. Tick loads were lowest over summer and peaked from late autumn (May) until early spring (September). Mating and engorgement of female ticks was highest over spring, and larval tick loads subsequently increased in early autumn (March). Nymphal tick loads increased in September, and adult tick loads increased in May. Our findings suggest the tuatara tick has a 2- or 3-year lifecycle. Mite loads were highest over summer and autumn, and peaked in March. Prevalences (proportion of hosts infected) and densities (estimated number of parasites per hectare) of ticks were similar among habitats, but tick loads (parasites per host) were higher in pastures than in forests and shrub. The prevalence and density of mites was higher in forests than in pasture or shrub, but mite loads were similar among habitats. We suggest that a higher density of tuatara in forests may reduce the ectoparasite loads of individuals through a dilution effect. Understanding host-parasite dynamics will help in the conservation management of both the host and its parasites.