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https://www.readbyqxmd.com/read/28433730/detection-of-rickettsia-helvetica-and-candidatus-r-tarasevichiae-dna-in-ixodes-persulcatus-ticks-collected-in-northeastern-european-russia-komi-republic
#1
Mikhail Yu Kartashov, Ludmila I Glushkova, Tamara P Mikryukova, Igor V Korabelnikov, Yulia I Egorova, Natalia L Tupota, Elena V Protopopova, Svetlana N Konovalova, Vladimir A Ternovoi, Valery B Loktev
The number of tick-borne infections in the northern European regions of Russia has increased considerably in the last years. In the present study, 676 unfed adult Ixodes persulcatus ticks were collected in the Komi Republic from 2011 to 2013 to study tick-borne rickettsioses. Rickettsia spp. DNA was detected by PCR in 51 (7.6%) ticks. The nucleotide sequence analysis of gltA fragments (765bp) from 51 ticks indicated that 60.8% and 39.2% of the ticks were infected with Rickettsia helvetica and Candidatus R. tarasevichiae, respectively...
April 6, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28433729/comparative-vertical-transmission-of-rickettsia-by-dermacentor-variabilis-and-amblyomma-maculatum
#2
Emma K Harris, Victoria I Verhoeve, Kaikhushroo H Banajee, Jacqueline A Macaluso, Abdu F Azad, Kevin R Macaluso
The geographical overlap of multiple Rickettsia and tick species coincides with the molecular detection of a variety of rickettsial agents in what may be novel tick hosts. However, little is known concerning transmissibility of rickettsial species by various tick hosts. To examine the vertical transmission potential between select tick and rickettsial species, two sympatric species of ticks, Dermacentor variabilis and Amblyomma maculatum, were exposed to five different rickettsial species, including Rickettsia rickettsii, Rickettsia parkeri, Rickettsia montanensis, Rickettsia amblyommatis, or flea-borne Rickettsia felis...
April 6, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28433728/vector-competence-of-amblyomma-americanum-acari-ixodidae-for-rickettsia-rickettsii
#3
Michael L Levin, Galina E Zemtsova, Lindsay F Killmaster, Alyssa Snellgrove, Lauren B M Schumacher
Rickettsia rickettsii - the etiologic agent of Rocky Mountain spotted fever (RMSF) - is widely spread across the Americas. In the US, Dermacentor spp. ticks are identified as primary vectors of R. rickettsii and Rhipicephalus sanguineus s.l. has been implicated in transmission of this pathogen in several locations in the Southwest. Conversely, ticks of the genus Amblyomma are recognized vectors of RMSF in Central and South America, but not in the US. A. americanum is one of the most aggressive human-biting ticks in the US, whose geographical range overlaps with that of reported RMSF cases...
April 12, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28427962/first-report-of-a-rickettsia-asembonensis-related-infecting-fleas-in-brazil
#4
Arannadia Barbosa Silva, Vinicius Figueiredo Vizzoni, Andréa Pereira Costa, Francisco Borges Costa, Jonas Moraes-Filho, Marcelo Bahia Labruna, Gilberto Salles Gazêta, Rita de Maria Seabra Nogueira
The present study was performed in a non-endemic area for spotted fever (SF) in Imperatriz microregion, state of Maranhão, Brazil. Blood samples and ectoparasites were collected from 300 dogs of the Imperatriz microregion. Canine serum samples were tested individually by indirect immunofluorescence assay (IFA), using five Rickettsia isolates from Brazil. Antibodies reactive to at least one of the five species of Rickettsia were detected in 1.6% of the dogs (5/300). These sera were considered reactive to Rickettsia rickettsii and Rickettsia amblyommatis or very closely related species...
April 17, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28427729/rickettsia-conorii-unusual-cause-of-diarrhoea
#5
Marta Magaz Martínez, Antonio Ramos, Jose Masegosa, Luis Abreu
No abstract text is available yet for this article.
April 17, 2017: Gastroenterología y Hepatología
https://www.readbyqxmd.com/read/28427445/parasites-pathogens-and-commensals-in-the-low-impact-non-native-amphipod-host-gammarus-roeselii
#6
Jamie Bojko, Karolina Bącela-Spychalska, Paul D Stebbing, Alison M Dunn, Michał Grabowski, Michał Rachalewski, Grant D Stentiford
BACKGROUND: Whilst vastly understudied, pathogens of non-native species (NNS) are increasingly recognised as important threats to native wildlife. This study builds upon recent recommendations for improved screening for pathogens in NNS by focusing on populations of Gammarus roeselii in Chojna, north-western Poland. At this location, and in other parts of continental Europe, G. roeselii is considered a well-established and relatively 'low-impact' invader, with little understanding about its underlying pathogen profile and even less on potential spill-over of these pathogens to native species...
April 20, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28426403/pcr-denaturing-gradient-gel-electrophoresis-as-a-useful-method-to-identify-of-intestinal-bacteria-flora-in-haemaphysalis-flava-ticks
#7
Tian-Yin Cheng, Guo-Hua Liu
Ticks are blood-sucking ectoparasites of great medical and veterinary significance that can transmit bacteria, protozoa, fungi and viruses, causing a variety of human and animal diseases worldwide. In the present study, the intestinal bacterial flora associated with Haemaphysalis flava ticks in different developmental stages were analyzed using polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE). Eleven distinct DGGE bands were found using PCR-DGGE method. Sequences analyses indicated that they belonged to Bacillus cereus, Candidatus rickettsia, Erwinia sp...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28424664/spotted-fever-epidemiology-and-vector-rickettsia-host-relationship-in-rio-de-janeiro-state
#8
Diego C Montenegro, Karla Bitencourth, Stefan V de Oliveira, Ana P Borsoi, Karen M Cardoso, Maria S B Sousa, Cristina Giordano-Dias, Marinete Amorim, Nicolau M Serra-Freire, Gilberto S Gazêta, Reginaldo P Brazil
The eco-epidemiological scenario of spotted fever (SF), a tick-borne disease that affects humans and other animals in several countries around the world, was analyzed in Rio de Janeiro (RJ) State, Brazil. During the last 34 years, 990 SF cases were reported in RJ (the Brazilian state with the highest population density), including 116 cases confirmed by serology (RIFI) or PCR, among 42.39% of the municipalities with reported cases of SF. The epidemiologic dynamics of SF in RJ State are very heterogeneous in time and space, with outbreaks, high mortality rates and periods of epidemiological silence (no SF cases reported)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28417248/ticks-and-tick-borne-pathogens-of-dogs-along-an-elevational-and-land-use-gradient-in-chiriqu%C3%A3-province-panam%C3%A3
#9
A Michelle Ferrell, R Jory Brinkerhoff, Juan Bernal, Sergio E Bermúdez
Systematic acarological surveys are useful tools in assessing risk to tick-borne infections, especially in areas where consistent clinical surveillance for tick-borne disease is lacking. Our goal was to identify environmental predictors of tick burdens on dogs and tick-borne infectious agents in dog-derived ticks in the Chiriquí Province of western Panama to draw inferences about spatio-temporal variation in human risk to tick-borne diseases. We used a model-selection approach to test the relative importance of elevation, human population size, vegetative cover, and change in landuse on patterns of tick parasitism on dogs...
April 17, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28408252/israeli-spotted-fever-in-sicily-description-of-two-cases-and-minireview
#10
REVIEW
Claudia Colomba, Marcello Trizzino, Anna Giammanco, Celestino Bonura, Danilo Di Bona, Manlio Tolomeo, Antonio Cascio
Mediterranean spotted fever (MSF) is endemic in Italy where Rickettsia conorii subsp. conorii was thought to be the only pathogenic rickettsia and Rhipicephalus sanguineus the vector and main reservoir. R. conorii subsp. israelensis, which belongs to the R. conorii complex, is the agent of Israeli spotted fever (ISF); apart from Israel, it has also been found in Italy (Sicily and Sardinia) and in different regions of Portugal. We describe here two severe cases of ISF which occurred in otherwise healthy Italian adults...
April 10, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28403767/tick-borne-infectious-diseases-in-australia
#11
REVIEW
Stephen R Graves, John Stenos
Tick bites in Australia can lead to a variety of illnesses in patients. These include infection, allergies, paralysis, autoimmune disease, post-infection fatigue and Australian multisystem disorder. Rickettsial (Rickettsia spp.) infections (Queensland tick typhus, Flinders Island spotted fever and Australian spotted fever) and Q fever (Coxiella burnetii) are the only systemic bacterial infections that are known to be transmitted by tick bites in Australia. Three species of local ticks transmit bacterial infection following a tick bite: the paralysis tick (Ixodes holocyclus) is endemic on the east coast of Australia and causes Queensland tick typhus due to R...
April 17, 2017: Medical Journal of Australia
https://www.readbyqxmd.com/read/28400593/rickettsial-seropositivity-in-the-indigenous-community-and-animal-farm-workers-and-vector-surveillance-in-peninsular-malaysia
#12
Kai Ling Kho, Fui Xian Koh, Lailatul Insyirah Mohd Hasan, Li Ping Wong, Masoumeh Ghane Kisomi, Awang Bulgiba, Quaza Nizamuddin Hassan Nizam, Sun Tee Tay
Rickettsioses are emerging zoonotic diseases that are often neglected in many countries in Southeast Asia. Rickettsial agents are transmitted to humans through exposure to infected arthropods. Limited data are available on the exposure of indigenous community and animal farm workers to the aetiological agents and arthropod vectors of rickettsioses in Peninsular Malaysia. Serological analysis of Rickettsia conorii and Rickettsia felis was performed for 102 individuals from the indigenous community at six rural villages and 87 workers from eight animal farms in Peninsular Malaysia in a cross-sectional study...
April 12, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28399271/high-prevalence-of-rickettsia-spp-in-dog-fleas-siphonaptera-pulicidae-in-rural-uganda
#13
Ana M Palomar, Aitor Cevidanes, Aránzazu Portillo, Gladis Kalema-Zikusoka, Andrea D Chirife, Lourdes Romero, Jesús Muro, Lawrence Mugisha, José A Oteo, Javier Millán
Fleas are known vectors of zoonotic agents. Thirty-five fleas, including 28 Ctenocephalides felis (Bouché), four Pulex irritans (L.), and three Echidnophaga gallinacea (Westwood) from 19 rural dogs from southwestern Uganda were analyzed for the presence of Rickettsia spp. (ompB, gltA, and 17 kDa fragment genes) and Bartonella spp. (rpoB and ITS genes) by PCR. Rickettsial DNA was detected in 27 out of 28 of Ct. felis and in two out of four P. irritans. None of the E. gallinacea specimens harbored Rickettsia DNA...
March 23, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399259/effect-of-rickettsia-felis-strain-variation-on-infection-transmission-and-fitness-in-the-cat-flea-siphonaptera-pulicidae
#14
Sean P Healy, Lisa D Brown, Melena R Hagstrom, Lane D Foil, Kevin R Macaluso
Rickettsia felis is a human pathogen transmitted by the cat flea, Ctenocephalides felis (Bouché) (str. LSU), as well as an obligate symbiont of the parthenogenic booklouse Liposcelis bostrychophila (Badonnel) (str. LSU-Lb). The influence of genetic variability in these two strains of R. felis on host specialization and fitness and possible resulting differences on infection and transmission kinetics in C. felis is unknown. Utilizing an artificial host system, cat fleas were exposed to a R. felis str. LSU-Lb-infected bloodmeal and monitored for infection at 7-d intervals for 28 d...
March 2, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399210/first-detection-of-rickettsia-typhi-and-rickettsia-felis-in-fleas-collected-from-client-owned-companion-animals-in-the-southern-great-plains
#15
Bruce H Noden, Suzanna Davidson, Jessica Lynn Smith, Faithful Williams
Flea-borne rickettsiosis occurs worldwide and includes a number of pathogens, namely, Rickettsia typhi and Rickettsia felis. Most studies in the United States have occurred in southern Texas and California where flea-borne rickettsiosis is endemic, resulting in a lack of information from other regions of the country. Between March and August 2016, 222 fleas were collected from 52 client-owned dogs and cats in two urban areas in Oklahoma. Fleas were identified using morphological characteristics then pooled and tested by polymerase chain reaction (PCR) using published primers for gltA, ompB, and 17-kDa...
March 25, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399204/detection-of-a-novel-rickettsia-from-leptotrombidium-scutellare-mites-acari-trombiculidae-from-shandong-of-china
#16
Yuting Huang, Li Zhao, Zhentang Zhang, Miaomiao Liu, Zaifeng Xue, Dongqiang Ma, Xifeng Sun, Yue Sun, Chuanmin Zhou, Xiangrong Qin, Yelei Zhu, Wenqian Li, Hao Yu, Xue-Jie Yu
Leptotrombidium scutellare mites, the vector of Orientia tsutsugamushi, have rarely been reported to associate with Rickettsia species. Three hundred nineteen chiggers were collected from the ears of 32 rodents captured in Huangdao District of Qingdao City, China, in October 2015. The chigger samples were tested for Rickettsia, severe fever with thrombocytopenia syndrome virus, and hantavirus by PCR or RT-PCR amplification. All mites were classified morphologically and molecularly as L. scutellare chiggers...
February 17, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28398677/preparing-for-biological-threats-addressing-the-needs-of-pregnant-women
#17
REVIEW
Amelia K Watson, Sascha Ellington, Christina Nelson, Tracee Treadwell, Denise J Jamieson, Dana M Meaney-Delman
Intentional release of infectious agents and biological weapons to cause illness and death has the potential to greatly impact pregnant women and their fetuses. We review what is known about the maternal and fetal effects of seven biological threats: Bacillus anthracis (anthrax); variola virus (smallpox); Clostridium botulinum toxin (botulism); Burkholderia mallei (glanders) and Burkholderia pseudomallei (melioidosis); Yersinia pestis (plague); Francisella tularensis (tularemia); and Rickettsia prowazekii (typhus)...
March 15, 2017: Birth Defects Res
https://www.readbyqxmd.com/read/28378988/serological-evidence-of-exposure-to-zoonotic-tick-borne-bacteria-in-pheasants-phasianus-colchicus
#18
Valentina Virginia Ebani, Fabrizio Bertelloni, Paolo Mani
INTRODUCTION AND OBJECTIVE: Previous studies on tick-borne pathogens in the avian population have focused mainly on the detection of the agents in ticks collected from birds, but data about the presence of tick-borne bacteria in these animals are scant. The aim of the presented study was to verify the exposure to some zoonotic tick-borne bacteria, in particular, Anaplasma phagocytophilum, Borrelia burgdorferi sensu lato, Coxiella burnetii, and the Rickettsia species of the Spotted Fever Group (SFG), in pheasants (Phasianus colchicus) living in a central Italy area, characterized by conditions favourable for the diffusion of the ticks...
March 22, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28378977/prevalence-of-infections-and-co-infections-with-6-pathogens-in-dermacentor-reticulatus-ticks-collected-in-eastern-poland
#19
Violetta Zając, Angelina Wójcik-Fatla, Anna Sawczyn, Ewa Cisak, Jacek Sroka, Anna Kloc, Zbigniew Zając, Alicja Buczek, Jacek Dutkiewicz, Katarzyna Bartosik
Occurrence of co-infections with various pathogens in ixodid ticks creates a risk of increased severity of tick-borne diseases in humans and animals exposed to bite of the ticks carrying multiple pathogens. Accordingly, co-infections in ticks were subject of numerous analyses, but almost exclusively with regard to Ixodes ricinus complex whereas potential tick vectors belonging to other genera were much less studied. Taking into consideration the role of Dermacentor reticulatus in the transmission of various pathogens, we carried out for the first time the comprehensive statistical analysis of co-infections occurring in this tick species...
March 21, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28377149/evaluation-of-an-association-of-alpha-cypermethrin-and-flufenoxuron-for-tick-control-in-an-area-at-risk-of-brazilian-spotted-fever
#20
José Brites-Neto, Jardel Brasil, Jeferson de Andrade, Gabriele Luciana Saqui
Brazilian spotted fever (BSF) is an endemic anthropozoonosis caused by Gram-negative bacteria (Rickettsia rickettsii) that is associated with the risk of human infection by ticks. In the city of Americana, São Paulo (SP), Brazil, there were 12 cases (67% lethal) between 2004 and 2015. This study evaluated the effectiveness of control over tick infestations in an area at risk of BSF, in a field trial on an association of alpha-cypermethrin (3%) and flufenoxuron (3%) (Tenopa(®)) conducted in Americana. The infestation levels of the target species (Amblyomma sculptum and Amblyomma dubitatum) in the field trial were evaluated through acarological surveys (CO2 traps) on days 0, 22, 43 and 62 after treatment, both in the treatment area and in a control area...
March 27, 2017: Veterinary Parasitology
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