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https://www.readbyqxmd.com/read/29777926/epidemiology-of-acute-febrile-illness-in-latin-america
#1
REVIEW
José Moreira, Clarisse S Bressan, Patricia Brasil, Andre M Siqueira
BACKGROUND: The causes of acute febrile illness (AFI) in Latin America (LA) are diverse and its complexity increase as the proportion of fever due to malaria decreases as control and new pathogens emerge in the region. In this context, it is important to shed light over the gaps on the epidemiological characteristics and the geographic range for many AFI aetiologies. AIMS: To review studies on community-acquired fever etiology other than malaria in LA, and to highlight knowledge gaps and challenges needing further investigation...
May 16, 2018: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29776935/ocular-manifestations-of-rickettsia-in-children-common-but-frequently-overlooked
#2
Sara Homem de Melo Marques, Marta Gomes Guerra, Catarina Almeida, Miguel Ribeiro
We review two cases of ocular manifestations of Rickettsia conorii infection in children. A girl who presented unilateral visual loss with focal retinitis and macular oedema and a boy with unilateral central scotoma and bilateral anterior uveitis. Progressive functional and anatomic recovery was observed after oral antibiotics and steroids were initiated.
May 18, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29776377/shifts-in-borrelia-burgdorferi-s-l-geno-species-infections-in-ixodes-ricinus-over-a-10-year-surveillance-period-in-the-city-of-hanover-germany-and-borrelia-miyamotoi-specific-reverse-line-blot-detection
#3
Katrin Blazejak, Marie-Kristin Raulf, Elisabeth Janecek, Daniela Jordan, Volker Fingerle, Christina Strube
BACKGROUND: Lyme borreliosis caused by spirochetes of the Borrelia burgdorferi (sensu lato) complex is still the most common tick-borne disease in Europe, posing a considerable threat to public health. The predominant vector in Europe is the widespread hard tick Ixodes ricinus, which also transmits the relapsing fever spirochete B. miyamotoi as well as pathogenic Rickettsiales (Anaplasma phagocytophilum, Rickettsia spp.). To assess the public health risk, a long-term monitoring of tick infection rates with the named pathogens is indispensable...
May 18, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29776375/range-wide-genetic-analysis-of-dermacentor-variabilis-and-its-francisella-like-endosymbionts-demonstrates-phylogeographic-concordance-between-both-taxa
#4
Emily L Kaufman, Nathan E Stone, Glen A Scoles, Crystal M Hepp, Joseph D Busch, David M Wagner
BACKGROUND: The American dog tick, Dermacentor variabilis, is an important vector of pathogens to humans, wildlife and domestic animals in North America. Although this tick species is widely distributed in the USA and Canada, knowledge of its range-wide phylogeographic patterns remains incomplete. METHODS: We carried out a phylogenetic analysis of D. variabilis using samples collected from 26 USA states and five Canadian provinces. Tick samples (n = 1053 in total) originated from two main sources: existing archives (2000-2011), and new collections made from 2012 to 2013...
May 18, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29774838/rickettsia-parkeri-in-dermacentor-parumapertus-ticks-mexico
#5
Sokani Sánchez-Montes, Andrés M López-Pérez, Carmen Guzmán-Cornejo, Pablo Colunga-Salas, Ingeborg Becker, Jesús Delgado-de la Mora, Jesús D Licona-Enríquez, David Delgado-de la Mora, Sandor E Karpathy, Christopher D Paddock, Gerardo Suzán
During a study to identify zoonotic pathogens in northwestern Mexico, we detected the presence of a rickettsial agent in Dermacentor parumapertus ticks from black-tailed jackrabbits (Lepus californicus). Comparison of 4 gene sequences (gltA, htrA, ompA, and ompB) of this agent showed 99%-100% identity with sequences of Rickettsia parkeri.
June 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29774138/clinical-evaluation-of-morgellons-disease-in-a-cohort-of-north-american-patients
#6
Melissa C Fesler, Marianne J Middelveen, Raphael B Stricker
Morgellons disease (MD) is a dermatological condition characterized by aberrant production of keratin and collagen fibers in skin. Although infection with Borrelia burgdorferi , the causative agent of Lyme disease (LD), has been associated with MD, relatively few studies have hitherto provided epidemiological evidence regarding this association. A cohort of 1000 seropositive North American LD patients was evaluated for the presence of MD. Patients were diagnosed with MD based on detection of microscopic fibers in skin lesions or under unbroken skin...
April 23, 2018: Dermatology Reports
https://www.readbyqxmd.com/read/29771344/prevalence-of-rickettsia-species-rickettsiales-rickettsiaceae-in-dermacentor-variabilis-ticks-acari-ixodidae-in-north-carolina
#7
Madhavi L Kakumanu, Loganathan Ponnusamy, Haley Sutton, Steven R Meshnick, William L Nicholson, Charles S Apperson
The American dog tick, Dermacentor variabilis (Say), is a vector of spotted fever group (SFG) rickettsiae, including Rickettsia rickettsii the causative organism of Rocky Mountain spotted fever (RMSF). In North Carolina, SFG rickettsioses (including RMSF) are a leading cause of tick-borne illness. Knowledge of the infection rate and geographic distribution of D. variabilis ticks infected with Rickettsia spp. provides information on the spatial distribution of public health risk. Accordingly, we extracted genomic DNA from adult D...
May 16, 2018: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29771340/reproductive-manipulators-in-the-bark-beetle-pityogenes-chalcographus-coleoptera-curculionidae-the-role-of-cardinium-rickettsia-spiroplasma-and-wolbachia
#8
Martin Schebeck, Lukas Feldkirchner, Belen Marín, Susanne Krumböck, Hannes Schuler, Christian Stauffer
Heritable bacterial endosymbionts can alter the biology of numerous arthropods. They can influence the reproductive outcome of infected hosts, thus affecting the ecology and evolution of various arthropod species. The spruce bark beetle Pityogenes chalcographus (L.) (Coleoptera: Curculionidae: Scolytinae) was reported to express partial, unidirectional crossing incompatibilities among certain European populations. Knowledge on the background of these findings is lacking; however, bacterial endosymbionts have been assumed to manipulate the reproduction of this beetle...
May 1, 2018: Journal of Insect Science
https://www.readbyqxmd.com/read/29769278/a-concise-review-of-the-epidemiology-and-diagnostics-of-rickettsioses-rickettsia-and-orientia-spp
#9
Mohammad Yazid Abdad, Rita Abou Abdallah, Pierre-Edouard Fournier, John Stenos, Shawn Vasoo
Rickettsioses are globally distributed and caused by the family Rickettsiaceae , which comprise a diverse and expanding list. These include two genera: Rickettsia and Orientia Serology has been traditionally the main-stay of diagnosis, although this has been limited by cross-reactions among closely related members and diminished sensitivity/utility in the acute phase of illness. Other techniques such as nucleic acid amplification tests using blood specimens or tissue swabs/biopsies, sequencing and mass-spectrometry have emerged in recent years for both pathogen and vector identification...
May 16, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29764730/molecular-detection-of-the-human-pathogen-rickettsia-parkeri-strain-atlantic-rainforest-in-amblyomma-ovale-ticks-in-argentina
#10
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
https://www.readbyqxmd.com/read/29762516/seasonal-patterns-in-the-prevalence-and-diversity-of-tick-borne-borrelia-burgdorferi-sensu-lato-anaplasma-phagocytophilum-and-rickettsia-spp-in-an-urban-temperate-forest-in-south-western-slovakia
#11
Michal Chvostáč, Eva Špitalská, Radovan Václav, Tatiana Vaculová, Lenka Minichová, Markéta Derdáková
In Europe, Ixodes ricinus is the most important vector of tick-borne zoonotic bacteria. It transmits spirochaetes from the Borrelia burgdorferi sensu lato complex, Anaplasma phagocytophilum and Rickettsia spp. Although spatial differences in the prevalence of tick-borne pathogens have been intensively studied, seasonal (within-year) fluctuations in the prevalence of these pathogens within sites are often overlooked. We analyzed the occurrence and seasonal dynamics of Ixodes ricinus in an urban forest in Bratislava, Slovakia...
May 15, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29754986/the-microbiome-of-haemaphysalis-lemuris-acari-ixodidae-a-possible-vector-of-pathogens-of-endangered-lemur-species-in-madagascar
#12
Paula Lado, Barbara Qurollo, Cathy Williams, Randall Junge, Hans Klompen
Lemurs are primate species that are endemic to Madagascar. At present, about 90% of lemur species are endangered, and 5 species are among the 25 most endangered primates worldwide. Health status is a major factor impacting the viability of wild populations of many endangered species including lemurs. Given this context, we analyzed the microbiome of 24 specimens of Haemaphysalis lemuris, the most common tick parasitizing lemurs in their native habitats. Ticks were collected from 6 lemur species and microbiomes analyzed using next-generation sequencing...
May 2, 2018: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29748120/diversity-of-coxiella-like-and-francisella-like-endosymbionts-and-rickettsia-spp-coxiella-burnetii-as-pathogens-in-the-tick-populations-of-slovakia-central-europe
#13
Eva Špitalská, Olivier Sparagano, Michal Stanko, Katarína Schwarzová, Zdenko Špitalský, Ľudovít Škultéty, Sabína Fumačová Havlíková
Ticks are important vectors of pathogens affecting humans and animals worldwide. They do not only carry pathogens but diverse commensal and symbiotic microorganisms are also present in ticks. A molecular screening for tick-borne pathogens and endosymbionts was carried out in Ixodes ricinus, Dermacentor reticulatus and Haemaphysalis inermis questing ticks collected in Slovakia. The presence of Rickettsia spp., Coxiella burnetii, Coxiella-like and Francisella-like microorganisms was evaluated by PCR in 605 individuals and by randomly sequencing 66 samples...
May 3, 2018: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29746378/acute-encephalitis-syndrome-in-gorakhpur-uttar-pradesh-2016-clinical-and-laboratory-findings
#14
Mahima Mittal, Vijay Bondre, Manoj Murhekar, Hirawati Deval, Winsley Rose, Valsan Philip Verghese, Mahim Mittal, Gajanan Patil, R Sabarinathan, Jeromie Wesley Vivian Thangaraj, K Kanagasabai, John Antony Jude Prakash, Nivedita Gupta, Manish Gupte, Mohan D Gupte
BACKGROUND: Seasonal outbreaks of acute encephalitis syndrome (AES) with high fatality have been occurring in Gorakhpur, Uttar Pradesh, India for several years. We conducted investigations during the 2016 outbreak, to identify the etiology. METHODS: We included 407 hospitalized AES patients with CSF pleocytosis (>5 cells/cmm) in our study. These patients were clinically examined; their blood and CSF samples were collected and investigated for scrub typhus (ST), Japanese encephalitis virus (JEV), dengue virus and spotted fever group of rickettsia (SFGR) by serology and/or PCR...
May 9, 2018: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/29736763/serum-cytokine-responses-in-rickettsia-felis-infected-febrile-children-ghana
#15
Jessica Rauch, Peter Sothmann, Cassandra Aldrich, Ben Hogan, Ellis Owusu-Dabo, Jürgen May, Daniel Eibach, Dennis Tappe
The intracellular pathogen Rickettsia felis causes flea-borne spotted fever and is increasingly recognized as an emerging cause of febrile illness in Africa, where co-infection with Plasmodium falciparum is common. Rickettsiae invade endothelial cells. Little is known, however, about the early immune responses to infection. In this study, we characterize for the first time the cytokine profile in the acute phase of illness caused by R. felis infection, as well as in plasmodial co-infection, using serum from 23 febrile children < 15 years of age and 20 age-matched healthy controls from Ghana...
May 8, 2018: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/29733258/molecular-evidence-of-rickettsia-spp-anaplasma-phagocytophilum-and-candidatus-neoehrlichia-mikurensis-in-ticks-from-natural-and-urban-habitats-in-eastern-romania
#16
Cristian Raileanu, Sara Moutailler, Daniela Porea, Luanda Oslobanu, Dragos Anita, Adriana Anita, Muriel Vayssier-Taussat, Gheorghe Savuta
Ixodid ticks are competent vectors for multiple pathogens, several of which cause infections in human. The medical importance of tick-borne pathogens is well known, yet unanswered questions remain regarding the occurrence of pathogens such as Rickettsia spp., Anaplasma phagocytophilum, and "Candidatus Neoehrlichia mikurensis" in questing ticks in Romania. Our objectives were to identify three emerging tick-borne zoonotic pathogens in eastern Romania, to assess their prevalence, establish co-infection rates, and to compare infection levels of selected pathogens in questing ticks collected from one suburban area in the city of Iaşi and one forested area located in the Danube Delta Biosphere Reserve...
May 7, 2018: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/29733028/green-crab-carcinus-maenas-symbiont-profiles-along-a-north-atlantic-invasion-route
#17
Jamie Bojko, Paul D Stebbing, Alison M Dunn, Kelly S Bateman, Fraser Clark, Rose C Kerr, Sarah Stewart-Clark, Ása Johannesen, Grant D Stentiford
The green crab Carcinus maenas is an invader on the Atlantic coast of Canada and the USA. In these locations, crab populations have facilitated the development of a legal fishery in which C. maenas is caught and sold, mainly for use as bait to capture economically important crustaceans such as American lobster Homarus americanus. The paucity of knowledge on the symbionts of invasive C. maenas in Canada and their potential for transfer to lobsters poses a potential risk of unintended transmission. We carried out a histological survey for symbionts of C...
May 7, 2018: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29730989/identification-of-tick-borne-pathogen-diversity-by-metagenomic-analysis-in-haemaphysalis-longicornis-from-xinyang-china
#18
Lu Zhuang, Juan Du, Xiao-Ming Cui, Hao Li, Fang Tang, Pan-He Zhang, Jian-Gong Hu, Yi-Gang Tong, Zhi-Chun Feng, Wei Liu
BACKGROUND: A wide variety of pathogens could be maintained and transmitted by Haemaphysalis longicornis. The aim of this study is to systematically examine the variety of pathogens carried by Haemaphysalis longicornis, an importnatn vector, in tick-borne diseases epidemic area, and to estimate the risk of human infection imposed by tick bites. METHODS: Adult questing ticks were collected in Xinyang, central China. Genomic DNA and RNA were extracted from 144 H. longicornis ticks individually, and sequenced respectively as the templates for high-throughput sequencing...
May 7, 2018: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/29729935/graft-versus-host-disease-after-an-infection-by-rickettsia-conorii-induced-by-a-tick-s-bite
#19
Anna Torrent, Christelle Ferrá, Josep-Maria Ribera
No abstract text is available yet for this article.
May 2, 2018: Medicina Clínica
https://www.readbyqxmd.com/read/29723373/skin-manifestations-of-tick-bites-in-humans
#20
Vidal Haddad, Michel Raineri Haddad, Mônica Santos, João Luiz Costa Cardoso
Ticks are blood-sucking arthropods that attach to human skin through oral devices causing diverse initial cutaneous manifestations, and may also transmit serious infectious diseases. In certain situations, the Health Teams (and especially dermatologists) may face difficulties in identifying the lesions and associating them to the parasites. To assist them in clinical diagnosis, we suggest a classification of the skin manifestations in primary lesions, which occur by the attachment the tick to the host (for toxicity and the anticoagulant substances in the saliva and/or marked inflammation by the penetration and permanence of the mouthparts) and secondary lesions that are manifestations of infections caused by rickettsia, bacteria, protozoa and fungi inoculated by the ticks...
March 2018: Anais Brasileiros de Dermatologia
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