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Ticks and Tick-borne Diseases

Thomas Geurden, Csilla Becskei, Robert H Six, Steven Maeder, Maria Stefania Latrofa, Domenico Otranto, Robert Farkas
Ticks are known to transmit pathogens which threaten the health and welfare of companion animals and man globally. In the present study, mainly adult ticks were collected from dogs and cats presented at their local veterinary practice in Hungary, France, Italy, Belgium (dogs only) and Germany (cats only), and identified based on tick morphology. If more than one tick was collected from a host animal, ticks were pooled by tick species for DNA extraction and subsequent PCR examination for the presence of tick-borne pathogens...
July 3, 2018: Ticks and Tick-borne Diseases
Samir Mechai, Gabriele Margos, Edward J Feil, L Robbin Lindsay, Pascal Michel, Serge Olivier Kotchi, Nick H Ogden
In North America, different strains of the Lyme disease-causing bacterium Borrelia burgdorferi sensu stricto cluster into phylogenetic groups that are associated with different levels of pathogenicity and, for some, specific rodent reservoir hosts. Here we explore whether landscape connectivity, by impacting host dispersal, influences B. burgdorferi s.s. spread patterns. This question is central to modelling spatial patterns of the spread of Lyme disease risk in the zone of northward range-expansion of B. burgdorferi s...
July 2, 2018: Ticks and Tick-borne Diseases
Catherine Santanello, Redir Barwari, Adriana Troyo
Tick-borne rickettsioses pose a major health threat among vector-borne infections in Missouri but there are some uncertainties regarding the vector competence and range of tick species, as well as the virulence of certain bacterial species. A survey was developed and implemented to assess local healthcare practitioners' awareness of the prevalence and diagnosis of tick-borne diseases. In addition, ticks collected from rural areas of St. Louis County, Missouri, were evaluated to detect spotted fever group (SFG) rickettsiae and to determine the most common tick species present...
June 25, 2018: Ticks and Tick-borne Diseases
Daniela Lamattina, Sebastián Andrés Costa, Juan Pablo Arrabal, José Manuel Venzal, Alberto Alejandro Guglielmone, Santiago Nava
Associations with environmental and host parameters were assessed to describe tick parasitism patterns in two medium-sized mammals of the Atlantic rainforest region of Argentina. Ticks found on 93 specimens of Nasua nasua and 26 specimens of Didelphis aurita captured at six sites in the Iguazú National Park were collected. Generalized linear models were constructed to explain the presence and abundance of ticks and the most appropriate ones were selected after stepwise simplification. The season, site and host body mass variables were important to explain the abundance of Amblyomma coelebs nymphs, while site was important to describe larval abundance of this species...
June 23, 2018: Ticks and Tick-borne Diseases
Miki Nakayasu, Minato Hirano, Memi Muto, Shintaro Kobayashi, Hiroaki Kariwa, Kentaro Yoshii
Tick-borne encephalitis virus (TBEV) is a zoonotic agent causing severe encephalitis in humans. IgM antibody detection is useful for the serological diagnosis of TBEV infection, because IgM has high specificity for each flavivirus and indicates a recent infection. Commercial IgM-ELISA kits are somewhat expensive and difficulties in their sensitivity have been suggested due to their format and formalin-inactivated antigens. Therefore, the development of an inexpensive IgM-ELISA with high specificity and sensitivity is needed...
June 23, 2018: Ticks and Tick-borne Diseases
Bibi Zhou, Youyun Yang, Tong Chen, Yongliang Lou, X Frank Yang
Borrelia burgdorferi sensu lato, the agent of Lyme disease, exists in nature through a complex enzootic life cycle that involves both ticks and mammals. The B. burgdorferi genome encodes five Oligopeptide ABC transporters (Opp) that are predicted to be involve in transport of various nutrients. Previously, it was reported that OppA5 is important for the optimal production of OspC, a major virulence factor of B. burgdorferi. In this study, possible role of another Oligopeptide ABC transporter, OppA4 in ospC expression was investigated by construction of an oppA4 deletion mutant and the complemented strain...
June 15, 2018: Ticks and Tick-borne Diseases
Glauber Meneses Barboza de Oliveira, Andreina de Carvalho Araújo, Josenilton Rodrigues Santos, Ivo Wesley Gomes da Silva, Marcelo Bahia Labruna, Mauricio Claudio Horta
Amblyomma rotundatum is an ixodid tick strictly associated with cold-blooded animals, among them the toad Rhinella jimi. This work aimed to evaluate the seasonal dynamics of larvae, nymphs, and adults of A. rotundatum parasitizing R. jimi in an area within the semi-arid Caatinga Biome of northeastern Brazil. Monthly sampling from February 2014 to January 2016 resulted in a total of 592 R. jimi toads captured and inspected for infestation by ticks, which were counted and identified. After the procedure, the toads were released with their ticks at the same capture site...
June 13, 2018: Ticks and Tick-borne Diseases
Shuo Li, Bobby Goyal, Joseph D Cooper, Ahmed Abdelbaki, Nishant Gupta, Yogesh Kumar
Babesiosis is a relatively common tick-borne parasitic infection of erythrocytes primarily affecting the northeastern United States. Babesiosis' prevalence and presentation have earned it the monikers "malaria of the northeast" and "Nantucket fever". Clinical presentation ranges from asymptomatic infection to severe infection including acute respiratory distress syndrome (ARDS) and disseminated intravascular coagulopathy (DIC) or death. Since 2008, there have been a number of reports of splenic rupture in patients with the disease...
June 12, 2018: Ticks and Tick-borne Diseases
Gustavo S Sanches, Joana Couto, Rita Silva-Pedrosa, Joana Ferrolho, Ana Sofia Santos, Maria Margarida Santos-Silva, Sandra Antunes, Ana Domingos
The present study aimed to expand knowledge regarding the molecular characterization of R. sanguineus s.l. in Portugal and to screen for ticks naturally infected with E. canis. A total of 113 R. sanguineus s.l. were collected questing or attached to domestic and wild animals from the 18 administrative regions of mainland Portugal. All the ticks were analyzed for the 16S rRNA and the partial sequences obtained showed high genetic similarities with specimens belonging to the temperate lineage. These sequences revealed eight haplotypes (H1‒H8), with a genetic distance ranging from 0...
June 11, 2018: Ticks and Tick-borne Diseases
Cíntia C Bernardo, Lucas P Barreto, Cárita de S R E Silva, Christian Luz, Walquíria Arruda, Éverton K K Fernandes
The current study compared the virulence of conidia and blastospores of Metarhizium robertsii (IP 146), M. anisopliae sensu lato (s.l.) (IP 363) and Beauveria bassiana s.l. (IP 361 and CG 307) against unfed larvae and engorged females of Rhipicephalus microplus (Acari: Ixodidae). In addition, the development of fungal propagules on tick cuticle was investigated. Tick larvae were treated with fungal suspensions at 106 , 107 or 108 propagules mL-1 , and percent mortality was assessed every two days. Engorged females were immersed in fungal suspensions (1...
June 6, 2018: Ticks and Tick-borne Diseases
Andrea Schroll, Igor Theurl, Enrico Georgi, Sabine Zange, Thomas Rettenbacher, Rosa Bellmann-Weiler, Guenter Weiss
Tularaemia is a rare zoonotic disease caused by Francisella tularensis in humans. In Europe infections of humans and animals are mainly caused by F. tularensis subspecies holarctica. We report the first three documented cases of tularaemia in humans in Western Austria.
June 6, 2018: Ticks and Tick-borne Diseases
Lesley Bell-Sakyi, Alistair Darby, Matthew Baylis, Benjamin L Makepeace
Tick cell lines are increasingly used in many fields of tick and tick-borne disease research. The Tick Cell Biobank was established in 2009 to facilitate the development and uptake of these unique and valuable resources. As well as serving as a repository for existing and new ixodid and argasid tick cell lines, the Tick Cell Biobank supplies cell lines and training in their maintenance to scientists worldwide and generates novel cultures from tick species not already represented in the collection. Now part of the Institute of Infection and Global Health at the University of Liverpool, the Tick Cell Biobank has embarked on a new phase of activity particularly targeted at research on problems caused by ticks, other arthropods and the diseases they transmit in less-developed, lower- and middle-income countries...
May 31, 2018: Ticks and Tick-borne Diseases
Tanya Josek, Kimberly K O Walden, Brian F Allan, Marianne Alleyne, Hugh M Robertson
Little is known about the molecular basis for the olfactory capabilities of the sensory Haller's organ on the forelegs of ticks. We first expanded the known repertoire of Ionotropic Receptors (IRs), a variant lineage of the ionotropic glutamate receptors, encoded by the black-legged Ixodes scapularis genome from 15 to 125. We then undertook a transcriptome study of fore- and hind-legs of this tick in an effort to identify candidate chemoreceptors differentially expressed in forelegs as likely to be involved in Haller's organ functions...
May 26, 2018: Ticks and Tick-borne Diseases
Jeiczon Jaimes-Dueñez, Omar Triana-Chávez, Ana M Mejía-Jaramillo
Anaplasma marginale is the most prevalent vector-borne pathogen in the livestock industry in Colombia, causing economic losses of approximately USD 4.2 million per year. The present study reports the seasonal transmission patterns, genetic diversity and phylogeographic traits of A. marginale strains in cattle and buffaloes from Colombian livestock areas. A three-point longitudinal survey was designed to evaluate the above characteristics of farms in the Caribbean and Orinoquía regions. The A. marginale prevalence was evaluated in 1432 cattle blood samples, 152 buffalo blood samples and the hemolymph of 439 ticks using semi-nested PCR (sn-PCR) targeting the msp5 gene...
May 21, 2018: Ticks and Tick-borne Diseases
Attila D Sándor, Jenő Kontschán, Olivier Plantard, Áron Péter, Sándor Hornok
Ixodes simplex is a tick species of bats, mainly reported from Schreibers' Bent-winged bat, Miniopterus schreibersii, all over its host's range. While being a common parasite of cave-dwelling bat species, the initial description of males is poor (based on a sole damaged specimen), lacking distinctive features. This study describes the male of I. simplex also providing measurements for a number of characters, using a series 10 of specimens. Males of I. simplex show the following characteristics distinct from males of I...
May 18, 2018: Ticks and Tick-borne Diseases
José Reck, Ugo Souza, Getúlio Souza, Eduardo Kieling, Bruno Dall'Agnol, Anelise Webster, Thais Michel, Rovaina Doyle, Thiago F Martins, Marcelo B Labruna, Fernanda Marks, Ricardo Ott, João Ricardo Martins
More than seventy tick species have been reported in Brazil. Despite the emergence of tick-borne diseases in Neotropical region, there are still limited data available on tick species parasitizing humans in Brazil. Rio Grande do Sul is the southernmost state of Brazil, comprising the only part of Brazilian territory inside the Pampa biome, as well as the transition between subtropical and temperate zones. Here, we report on human parasitism by ticks in Rio Grande do Sul state between 2004 and 2017. Seventy cases of human parasitism by ticks were recorded, with a total of 81 tick specimens collected...
May 18, 2018: Ticks and Tick-borne Diseases
Mourad Ben Said, Alaa Ben Asker, Hanène Belkahia, Raoua Ghribi, Rachid Selmi, Lilia Messadi
Anaplasma marginale, which is responsible for bovine anaplasmosis in tropical and subtropical regions, is a tick-borne obligatory intraerythrocytic bacterium of cattle and wild ruminants. In Tunisia, information about the genetic diversity and the phylogeny of A. marginale strains are limited to the msp4 gene analysis. The purpose of this study is to investigate A. marginale isolates infecting 16 cattle located in different bioclimatic areas of northern Tunisia with single gene analysis and multilocus sequence typing methods on the basis of seven partial genes (dnaA, ftsZ, groEL, lipA, secY, recA and sucB)...
May 12, 2018: Ticks and Tick-borne Diseases
Daniela Lamattina, Evelina Luisa Tarragona, Santiago Nava
Human rickettsioses caused by Rickettsia parkeri strain Atlantic rainforest in Brazil motivated the analysis of Amblyomma ovale ticks in Misiones province, a similar ecological region in northeastern Argentina. During 2010-2017, 393 A. ovale ticks were collected from domestic and wild animals and from vegetation, and 177 were pooled for rickettsial detection by PCR targeting the gltA, ompA and ompB genes. A sample consisting of a pool of two A. ovale adults collected on Nasua nasua was positive for Rickettsia parkeri strain Atlantic rainforest...
May 5, 2018: Ticks and Tick-borne Diseases
Angélica Hernández-Jarguín, Sandra Díaz-Sánchez, Margarita Villar, José de la Fuente
An innovative metaomics approach integrating metatranscriptomics and metaproteomics was used to characterize bacterial communities in the microbiota of the Lyme borreliosis spirochete vector, Ixodes ricinus (Acari: Ixodidae). Whole internal tissues and salivary glands from unfed larvae and female ticks, respectively were used. Reused I. ricinus RNA-sequencing data for metranscriptomics analysis together with metaproteomics provided a better characterization of tick bacterial microbiota by increasing bacteria identification and support for identified bacteria with putative functional implications...
May 5, 2018: Ticks and Tick-borne Diseases
Shunya Shibata, Thillaiampalam Sivakumar, Ikuo Igarashi, Rika Umemiya-Shirafuji, Hisashi Inokuma, Shinya Fukumoto, Naoaki Yokoyama
Species of Theileria are tick-borne hemoprotozoan parasites of ruminants that can cause severe clinical disease. In this study, blood samples were obtained from 91 wild sika deer in various districts in Hokkaido, Japan. Samples were tested using a PCR assay designed to amplify a full-length major piroplasm surface protein (MPSP) gene of a cervine Theileria species, designated as Theileria sp. (sika 1). The amplicons of 57 out of 89 PCR-positive samples were cloned and sequenced. The sequences shared 99.1%-100% identity scores, indicating the MPSP gene of Theileria sp...
May 4, 2018: Ticks and Tick-borne Diseases
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