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https://www.readbyqxmd.com/read/27934910/extensive-genetic-diversity-of-rickettsiales-bacteria-in-multiple-mosquito-species
#1
Wen-Ping Guo, Jun-Hua Tian, Xian-Dan Lin, Xue-Bing Ni, Xiao-Ping Chen, Yong Liao, Si-Yuan Yang, J Stephen Dumler, Edward C Holmes, Yong-Zhen Zhang
Rickettsiales are important zoonotic pathogens, causing severe disease in humans globally. Although mosquitoes are an important vector for diverse pathogens, with the exception of members of the genus Wolbachia little is known about their role in the transmission of Rickettsiales. Herein, Rickettsiales were identified by PCR in five species of mosquitoes (Anopheles sinensis, Armigeres subalbatus, Aedes albopictus, Culex quinquefasciatus and Cu. tritaeniorhynchus) collected from three Chinese provinces during 2014-2015...
December 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27928094/seroconversion-to-causes-of-febrile-illness-in-mongolian-peacekeepers-deployed-to-south-sudan
#2
Altangerel Enkhtsetseg, Rendoo Davadoorj, Stefan Fernandez, Duangrat Mongkolsirichaikul, Damdin Altantuul, Erdene Elbegdorj, Lkhagvasuren Ganchimeg, Samuel L Yingst
Immediately before deployment (Fall 2012) and after deployment (Spring 2013) in support of United Nations peacekeeping operations, Mongolian Armed Forces medical personnel obtained serum samples from the first contingent of Mongolian peacekeepers deploying to South Sudan to monitor serologic evidence of exposure to diseases that cause acute febrile illness. A total of 632 paired samples were tested for IgG antibody for the following (number of seroconversions in parentheses): Rickettsia (spotted fever and typhus groups) (25), West Nile fever virus (WNV) (23), Coxiella burnetii (causative agent of Q fever) (12), dengue virus (8), leptospirosis (6), chikungunya virus (0), Congo-Crimean hemorrhagic fever virus (0), Japanese encephalitis virus (0), and Rift Valley fever virus (0)...
December 7, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27925056/probability-of-occurrence-of-the-brazilian-spotted-fever-in-northeast-of-paran%C3%A3-state-brazil
#3
Flávio Haragushiku Otomura, Jessé Henrique Truppel, Jonas Moraes, Marcelo Bahia Labruna, Diogo Francisco Rossoni, Rubens Massafera, Vanete Thomaz Soccol, Ueslei Teodoro
Brazilian spotted fever (BSF) is a fatal zoonosis because of the difficulties in its early diagnosis and treatment. Occurrences of BSF in the northeast of the state of Paraná prompted investigation of areas at risk of this rickettsiosis in the municipalities of Japira, Jaboti, Pinhalão and Tomazina. To determine the areas at risk, 592 serum samples from dogs and 230 from equids were analyzed by means of the indirect immunofluorescence assay (IFA) for Rickettsia rickettsii and R. parkeri . In addition, risk probability maps were drawn up using the kriging indicator technique...
December 1, 2016: Revista Brasileira de Parasitologia Veterinária, Brazilian Journal of Veterinary Parasitology
https://www.readbyqxmd.com/read/27923669/emergence-of-tick-borne-pathogens-borrelia-burgdorferi-sensu-lato-anaplasma-phagocytophilum-ricketsia-raoultii-and-babesia-microti-in-the-kyiv-urban-parks-ukraine
#4
Yuliya M Didyk, Lucia Blaňárová, Svyatoslav Pogrebnyak, Igor Akimov, Branislav Peťko, Bronislava Víchová
To date, only limited data about the presence of ticks and circulation of tick-borne pathogens in urban parks of Kyiv in northern Ukraine are available. In total, 767 ticks (696 Ixodes ricinus and 69 Dermacentor reticulatus) collected in seven urban parks and one suburban oak wood park in Kyiv were individually analyzed by the PCR assays. Tick-borne pathogens, namely spirochetes from Borrelia burgdorferi sensu lato complex, Anaplasma phagocytophilum, and Babesia microti, were detected in 11.1% of tested I. ricinus ticks...
October 11, 2016: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/27922802/urban-breeding-corvids-as-disseminators-of-ticks-and-emerging-tick-borne-pathogens
#5
Attila D Sándor, Zsuzsa Kalmár, Ioana Matei, Angela Monica Ionică, Ioan-Daniel Mărcuţan
Crows (Corvidae) are common city dwellers worldwide and are increasingly important subjects of epidemiology studies. Although their importance as hosts and transmitters of a number of zoonotic parasites and pathogens is well known, there are no studies on their importance as tick hosts. After mosquitoes, ticks are the most important vectors of zoonotic pathogens, especially for those causing emerging zoonotic diseases. Pathogenic bacteria, especially Borrelia spp., Rickettsia spp., and Anaplasma spp., vectored by ticks, are the cause for most vector-borne diseases in Europe...
December 6, 2016: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/27913878/piroplasms-in-brown-hyaenas-parahyaena-brunnea-and-spotted-hyaenas-crocuta-crocuta-in-namibia-and-south-africa-are-closely-related-to-babesia-lengau
#6
Richard E J Burroughs, Barend L Penzhorn, Ingrid Wiesel, Nancy Barker, Ilse Vorster, Marinda C Oosthuizen
The objective of our study was identification and molecular characterization of piroplasms and rickettsias occurring in brown (Parahyaena brunnea) and spotted hyaenas (Crocuta crocuta) from various localities in Namibia and South Africa. Whole blood (n = 59) and skin (n = 3) specimens from brown (n = 15) and spotted hyaenas (n = 47) were screened for the presence of Babesia, Theileria, Ehrlichia and Anaplasma species using the reverse line blot (RLB) hybridization technique. PCR products of 52/62 (83...
December 2, 2016: Parasitology Research
https://www.readbyqxmd.com/read/27894280/is-there-any-association-between-sarcoidosis-and-infectious-agents-a-systematic-review-and-meta-analysis
#7
Tiago Esteves, Gloria Aparicio, Vicente Garcia-Patos
BACKGROUND: During the last few years, investigators have debated the role that infectious agents may have in sarcoidosis pathogenesis. With the emergence of new molecular biology techniques, several studies have been conducted; therefore, we performed a meta-analysis in order to better explain this possible association. METHODS: This review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement from the Cochrane collaboration guidelines...
November 28, 2016: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/27890889/first-molecular-detection-of-tick-borne-pathogens-in-dogs-from-jiangxi-china
#8
Weiqing Zheng, Mingming Liu, Paul Franck Adjou Moumouni, Xiaoqing Liu, Artemis Efstratiou, Zhanbin Liu, Yangqing Liu, Huiying Tao, Huanping Guo, Guanbo Wang, Yang Gao, Zifen Li, Aaron Edmund Ringo, Charoonluk Jirapattharasate, Haiying Chen, Xuenan Xuan
In this study, blood samples obtained from 162 dogs in Jiangxi, China, were employed in molecular screening of canine tick-borne pathogens by PCR and sequencing. Babesia spp. gene fragment was detected in 12 (7.41%) dogs. All samples were negative for Hepatozoon spp., Ehrlichia canis, Coxiella spp., Borrelia spp., Rickettsia spp. and Anaplasma platys. Species-specific PCR analysis further confirmed that 8 (4.94%) and 4 (2.47%) dogs were infected by Babesia canis vogeli and Babesia gibsoni, respectively. Based on our analyses, Babesia spp...
November 26, 2016: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/27884170/first-report-of-rickettsia-raoultii-and-r-slovaca-in-melophagus-ovinus-the-sheep-ked
#9
Dan Liu, Yuan-Zhi Wang, Huan Zhang, Zhi-Qiang Liu, Ha-Zi Wureli, Shi-Wei Wang, Chang-Chun Tu, Chuang-Fu Chen
BACKGROUND: Melophagus ovinus (Diptera: Hippoboscidae), a hematophagous ectoparasite, is mainly found in Europe, Northwestern Africa, and Asia. This wingless fly infests sheep, rabbits, and red foxes, and causes inflammation, wool loss and skin damage. Furthermore, this parasite has been shown to transmit diseases, and plays a role as a vector. Herein, we investigated the presence of various Rickettsia species in M. ovinus. METHODS: In this study, a total of 95 sheep keds were collected in Kuqa County and Alaer City southern region of Xinjiang Uygur Autonomous Region, northwestern China...
November 25, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27882570/ultrastructural-and-biomolecular-detection-of-rickettsiales-like-organisms-in-tissues-of-rainbow-trout-with-red-mark-syndrome
#10
M Galeotti, M Manzano, P Beraldo, C Bulfon, G Rossi, D Volpatti, G E Magi
Red mark syndrome (RMS) and US strawberry disease (US SD) are skin disorders affecting rainbow trout farmed in Europe and USA. The disease etiology has not yet been established. In spite of specific investigations, identifying Rickettsia-like organism (RLO)- and Midichloria-like organism (MLO)-related DNA in affected individuals, these pathogens have never been observed. We performed histological, ultrastructural and biomolecular analysis on skin and spleen samples of trout with RMS. Examination by TEM revealed the presence of intracytoplasmic microorganisms resembling Rickettsiales within macrophages, fibroblasts and erythrocytes...
November 24, 2016: Journal of Fish Diseases
https://www.readbyqxmd.com/read/27880877/association-of-the-occurrence-of-brazilian-spotted-fever-and-atlantic-rain-forest-fragmentation-in-the-s%C3%A3-o-paulo-metropolitan-region-brazil
#11
Claudia A Scinachi, Gabriela A C G Takeda, Luís Filipe Mucci, Adriano Pinter
Brazilian Spotted Fever (BSF) is a zoonotic disease caused by the bacterium Rickettsia rickettsii. In the São Paulo Metropolitan Region (SPMR) it is transmitted by Amblyomma aureolatum ticks. In this region, annual lethality of the disease can reach 80% and spatial occurrence depends on environmental factors and more particularly on the presence and interaction of domestic and wild carnivores as well as the presence and characteristics of the remnant Atlantic Rain Forest patches. This study analyzed the association between forest fragmentation and its influence on the risk of occurrence of the disease in the human population...
November 21, 2016: Acta Tropica
https://www.readbyqxmd.com/read/27880753/notes-from-the-field-community-based-prevention-of-rocky-mountain-spotted-fever-sonora-mexico-2016
#12
Anne Straily, Naomi Drexler, Denica Cruz-Loustaunau, Christopher D Paddock, Gerardo Alvarez-Hernandez
Rocky Mountain spotted fever (RMSF), a life-threatening tickborne zoonosis caused by Rickettsia rickettsii, is a reemerging disease in Mexico (1,2). R. rickettsii is an intracellular bacterium that infects vascular endothelium and can cause multisystem organ failure and death in the absence of timely administration of a tetracycline-class antibiotic, typically doxycycline. Epidemic RMSF, as described in parts of Arizona and Mexico, is associated with massive local infestations of the brown dog tick (Rhiphicephalus sanguineus sensu lato) on domestic dogs and in peridomestic settings that result in high rates of human exposure; for example, during 2003-2012, in Arizona the incidence of RMSF in the three most highly affected communities was 150 times the U...
November 25, 2016: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27875529/cd4-t-cells-are-as-protective-as-cd8-t-cells-against-rickettsia-typhi-infection-by-activating-macrophage-bactericidal-activity
#13
Kristin Moderzynski, Stefanie Papp, Jessica Rauch, Liza Heine, Svenja Kuehl, Ulricke Richardt, Bernhard Fleischer, Anke Osterloh
Rickettsia typhi is an intracellular bacterium that causes endemic typhus, a febrile disease that can be fatal due to complications including pneumonia, hepatitis and meningoencephalitis, the latter being a regular outcome in T and B cell-deficient C57BL/6 RAG1-/- mice upon Rickettsia typhi infection. Here, we show that CD4+ TH1 cells that are generated in C57BL/6 mice upon R. typhi infection are as protective as cytotoxic CD8+ T cells. CD4+- as well as CD8+-deficient C57BL/6 survived the infection without showing symptoms of disease at any point in time...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27869588/human-infection-with-novel-spotted-fever-group-rickettsia-genotype-china-2015
#14
Hao Li, Xiao-Ming Cui, Ning Cui, Zhen-Dong Yang, Jian-Gong Hu, Ya-Di Fan, Xue-Juan Fan, Lan Zhang, Pan-He Zhang, Wei Liu, Wu-Chun Cao
Only 4 species of spotted fever group rickettsiae have been detected in humans in China. However, phylogenetic analysis of samples from 5 ill patients in China indicated infection with a novel spotted fever group Rickettsia, designated Rickettsia sp. XY99. Clinical signs resembled those of severe fever with thrombocytopenia syndrome.
December 2016: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/27861477/-complications-and-cause-of-death-in-mexican-children-with-rocky-mountain-spotted-fever
#15
Miguel Ángel Martínez-Medina, Adela Rascón-Alcantar
BACKGROUND: Rocky Mountain spotted fever is a life threatening disease caused by Rickettsia rickettsia, characterized by multisystem involvement. METHODS: We studied 19 dead children with Rocky Mountain spotted fever. All children who were suspected of having rickettsial infections were defined as having Rocky Mountain spotted fever by serology test and clinical features. Through the analysis of each case, we identified the clinical profile and complications associated to the death of a patient...
November 2016: Gaceta Médica de México
https://www.readbyqxmd.com/read/27847418/morphological-and-molecular-identification-of-the-brown-dog-tick-rhipicephalus-sanguineus-and-the-camel-tick-hyalomma-dromedarii-acari-ixodidae-vectors-of-rickettsioses-in-egypt
#16
Hend H A M Abdullah, Amal El-Molla, Fayez A Salib, Nesreen A T Allam, Alaa A Ghazy, Sobhy Abdel-Shafy
AIM: Rickettsioses have an epidemiological importance that includes pathogens, vectors, and hosts. The dog tick Rhipicephalus sanguineus and the camel tick Hyalomma dromedarii play important roles as vectors and reservoirs of Rickettsiae. The aim of this study was to determine the prevalence of Rickettsiae in ixodid ticks species infesting dogs and camels in Egypt, in addition to, the morphological and molecular identification of R. sanguineus and H. dromedarii. MATERIALS AND METHODS: A total of 601 and 104 of ticks' specimens were collected from dogs and camels, respectively, in Cairo, Giza and Sinai provinces...
October 2016: Veterinary World
https://www.readbyqxmd.com/read/27846275/prevalence-of-rickettsia-spp-in-ticks-and-serological-and-clinical-outcomes-in-tick-bitten-individuals-in-sweden-and-on-the-%C3%A3-land-islands
#17
Anders Lindblom, Katarina Wallménius, Johanna Sjöwall, Linda Fryland, Peter Wilhelmsson, Per-Eric Lindgren, Pia Forsberg, Kenneth Nilsson
Tick-transmitted diseases are an emerging health problem, and the hard tick Ixodes ricinus is the main vector for Borrelia spp., tick-borne encephalitis virus and most of the spotted fever Rickettsiae in Europe. The aim of the present study was to examine the incidence of rickettsial infection in the southernmost and south central parts of Sweden and the Åland Islands in Finland, the risk of infection in humans and its correlation with a bite of a Rickettsia-infected tick, the self-reported symptoms of rickettsial disease, and the prevalence of co-infection between Rickettsia spp...
2016: PloS One
https://www.readbyqxmd.com/read/27834404/small-regulatory-rnas-of-rickettsia-conorii
#18
Hema P Narra, Casey L C Schroeder, Abha Sahni, Mark Rojas, Kamil Khanipov, Yuriy Fofanov, Sanjeev K Sahni
Small regulatory RNAs comprise critically important modulators of gene expression in bacteria, yet very little is known about their prevalence and functions in Rickettsia species. R. conorii, the causative agent of Mediterranean spotted fever, is a tick-borne pathogen that primarily infects microvascular endothelium in humans. We have determined the transcriptional landscape of R. conorii during infection of Human Microvascular Endothelial Cells (HMECs) by strand-specific RNA sequencing to identify 4 riboswitches, 13 trans-acting (intergenic), and 22 cis-acting (antisense) small RNAs (termed 'Rc_sR's)...
November 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27832582/rickettsia-evades-a-tense-situation
#19
Keith Ireton
Many bacterial pathogens remodel the plasma membrane of the host cell in order to promote infection. In a recent Cell paper, Lamason et al. (2016) identify a mechanism of remodeling by pathogenic Rickettsia that involves manipulation of plasma membrane tension.
November 9, 2016: Cell Host & Microbe
https://www.readbyqxmd.com/read/27822541/16s-rrna-amplicon-sequencing-for-epidemiological-surveys-of-bacteria-in-wildlife
#20
Maxime Galan, Maria Razzauti, Emilie Bard, Maria Bernard, Carine Brouat, Nathalie Charbonnel, Alexandre Dehne-Garcia, Anne Loiseau, Caroline Tatard, Lucie Tamisier, Muriel Vayssier-Taussat, Helene Vignes, Jean-François Cosson
The human impact on natural habitats is increasing the complexity of human-wildlife interactions and leading to the emergence of infectious diseases worldwide. Highly successful synanthropic wildlife species, such as rodents, will undoubtedly play an increasingly important role in transmitting zoonotic diseases. We investigated the potential for recent developments in 16S rRNA amplicon sequencing to facilitate the multiplexing of the large numbers of samples needed to improve our understanding of the risk of zoonotic disease transmission posed by urban rodents in West Africa...
July 2016: MSystems
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