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https://www.readbyqxmd.com/read/28735308/bactericidal-activity-of-octenidine-to-various-genospecies-of-borrelia-burgdorferi-sensu-lato-spirochetes-in-vitro-and-in-vivo
#1
Stanisława Tylewska-Wierzbanowska, Urszula Rogulska, Grażyna Lewandowska, Tomasz Chmielewski
The aim of our studies was to invent a reliable method for detection of the bactericidal activity of disinfectants against Borrelia burgdorferi in suspension (in vitro) and in cell line cultures (in vivo). In the suspension method, 0.01% octenidine at 20°C and 35°C was bactericidal to Borrelia afzeli; Borrelia garini, B. burgdorferi sensu stricto after 5 minutes treatment. Increase of the temperature to 35°C speed up the bactericidal effect to 1 minute. The bactericidal action of octenidine towards B. burgdorferi spirochetes growing in fibroblasts was less effective and needed a longer time to kill them than in the suspension...
July 6, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/28721843/treponema-rectale-sp-nov-a-spirochete-isolated-from-the-bovine-rectum
#2
Gareth J Staton, Kerry Newbrook, Simon R Clegg, Richard J Birtles, Nicholas J Evans, Stuart D Carter
A Gram-stain-negative, obligatory anaerobic spirochete, CHPAT, was isolated from the rectal tissue of a Holstein-Friesian cow. On the basis of 16S rRNA gene comparisons, CHPAT was most closely related to the human oral spirochete, Treponema parvum, with 88.8 % sequence identity. Further characterisation on the basis of recA gene sequence analysis, cell morphology, pattern of growth and physiological profiling identified marked differences with respect to other recognised species of the genus Treponema. Microscopically, the helical cells measured approximately 1-5 µm long and 0...
July 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28717130/polymicrobial-infections-in-brain-tissue-from-alzheimer-s-disease-patients
#3
Diana Pisa, Ruth Alonso, Ana M Fernández-Fernández, Alberto Rábano, Luis Carrasco
Several studies have advanced the idea that the etiology of Alzheimer's disease (AD) could be microbial in origin. In the present study, we tested the possibility that polymicrobial infections exist in tissue from the entorhinal cortex/hippocampus region of patients with AD using immunohistochemistry (confocal laser scanning microscopy) and highly sensitive (nested) PCR. We found no evidence for expression of early (ICP0) or late (ICP5) proteins of herpes simplex virus type 1 (HSV-1) in brain sections. A polyclonal antibody against Borrelia detected structures that appeared not related to spirochetes, but rather to fungi...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28714333/-borrelia-miyamotoi-a-recently-identified-human-pathogenic-tick-borne-relapsing-fever-spirochete
#4
Sándor Szekeres, András Lakos, Gábor Földvári
Borrelia miyamotoi is a recently described relapsing fever spirochete transmitted by ticks of the Ixodes ricinus complex. This pathogen is different from Borrelia burgdorferi sensu lato (the Lyme borreliosis spirochetes) in its epidemiology, ecology and also genetics. Over 50 patients have been described worldwide with Borrelia miyamotoi disease, and three immunocompromised patients were reported with neurological symptoms. Our knowledge about Borrelia miyamotoi infection in ticks and its distribution in different habitats and also the mechanism of the infection is limited...
July 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/28714113/secondary-syphilis-primarily-presenting-with-multiple-nodules-on-the-scalp-case-report-and-published-work-review
#5
Fan Li, Tingting Wang, Lin Wang
Syphilis, a sexually transmitted disease caused by Treponema pallidum, manifests with a broad spectrum of clinical presentations that usually involves skin. Nodular secondary syphilis occurs rarely, and mostly manifests as disseminated papulonodules or plaques over the trunk and limbs. We report an extremely rare case of nodular secondary syphilis that primarily presented with multiple nodules on the scalp, resembling Rosai-Dorfman disease or cutaneous malignant metastasis. Immunohistochemistry confirmed T...
July 17, 2017: Journal of Dermatology
https://www.readbyqxmd.com/read/28713599/lyme-carditis-buried-beneath-st-segment-elevations
#6
Basia Michalski, Adrian Umpierrez De Reguero
Lyme disease is caused by the spirochete Borrelia burgdorferi and is carried to human hosts by infected ticks. There are nearly 30,000 cases of Lyme disease reported to the CDC each year, with 3-4% of those cases reporting Lyme carditis. The most common manifestation of Lyme carditis is partial heart block following bacterial-induced inflammation of the conducting nodes. Here we report a 45-year-old gentleman that presented to the hospital with intense nonradiating chest pressure and tightness. Lab studies were remarkable for elevated troponins...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28706469/metabolic-response-of-porcine-colon-explants-to-in-vitro-infection-by-brachyspira-hyodysenteriae-a-leap-into-disease-pathophysiology
#7
Thijs Welle, Anna T Hoekstra, Ineke A J J M Daemen, Celia R Berkers, Matheus O Costa
INTRODUCTION: Swine dysentery caused by Brachyspira hyodysenteriae is a production limiting disease in pig farming. Currently antimicrobial therapy is the only treatment and control method available. OBJECTIVE: The aim of this study was to characterize the metabolic response of porcine colon explants to infection by B. hyodysenteriae. METHODS: Porcine colon explants exposed to B. hyodysenteriae were analyzed for histopathological, metabolic and pro-inflammatory gene expression changes...
2017: Metabolomics: Official Journal of the Metabolomic Society
https://www.readbyqxmd.com/read/28694446/ticks-infected-via-co-feeding-transmission-can-transmit-lyme-borreliosis-to-vertebrate-hosts
#8
Alessandro Belli, Anouk Sarr, Olivier Rais, Ryan O M Rego, Maarten J Voordouw
Vector-borne pathogens establish systemic infections in host tissues to maximize transmission to arthropod vectors. Co-feeding transmission occurs when the pathogen is transferred between infected and naive vectors that feed in close spatiotemporal proximity on a host that has not yet developed a systemic infection. Borrelia afzelii is a tick-borne spirochete bacterium that causes Lyme borreliosis (LB) and is capable of co-feeding transmission. Whether ticks that acquire LB pathogens via co-feeding are actually infectious to vertebrate hosts has never been tested...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28690096/modeling-the-effects-of-variable-feeding-patterns-of-larval-ticks-on-the-transmission-of-borrelia-lusitaniae-and-borrelia-afzelii
#9
Luca Ferreri, Silvia Perazzo, Ezio Venturino, Mario Giacobini, Luigi Bertolotti, Alessandro Mannelli
Spirochetes belonging to the Borrelia burgdoferi sensu lato (sl) group cause Lyme Borreliosis (LB), which is the most commonly reported vector-borne zoonosis in Europe. B. burgdorferi sl is maintained in nature in a complex cycle involving Ixodes ricinus ticks and several species of vertebrate hosts. The transmission dynamics of B. burgdorferi sl is complicated by the varying competence of animals for different genospecies of spirochetes that, in turn, vary in their capability of causing disease. In this study, a set of difference equations simplifying the complex interaction between vectors and their hosts (competent and not for Borrelia) is built to gain insights into conditions underlying the dominance of B...
July 6, 2017: Theoretical Population Biology
https://www.readbyqxmd.com/read/28682315/congenital-syphilis-in-neonates-with-nonreactive-nontreponemal-test-results
#10
P S Wozniak, J B Cantey, F Zeray, N K Leos, J S Sheffield, G D Wendel, P J Sánchez
OBJECTIVE: Infants whose mothers had syphilis during pregnancy were studied to determine how often exposed newborns with normal physical examinations and nonreactive nontreponemal serologic tests had abnormal laboratory or radiographic studies. STUDY DESIGN: Retrospective analysis of prospectively collected data from infants born to mothers with syphilis and had a normal examination and a nonreactive nontreponemal test. Some infants had IgM immunoblotting, PCR testing or rabbit infectivity testing (RIT) performed...
July 6, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28681315/management-of-lyme-disease-in-european-children-a-review-for-practical-purpose
#11
REVIEW
Matteo D'Alessandro, Anna Loy, Elio Castagnola
PURPOSE OF REVIEW: Lyme disease is a tick-borne zoonosis transmitted through a bite of a tick carrying a spirochete belonging to Borrelia species. In the last 20 years, the reported incidence of Lyme disease is increased by three times in Europe. Clinically, the illness develops through a primary stage with a typical skin rash (erythema marginatum), then a secondary stage with possible neurologic or cardiac involvement. The last stage (chronic Lyme disease) is mainly represented by arthritis or late neurological complications but nowadays is rarely seen due to precocious antibiotic use...
July 5, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28674060/in-vitro-susceptibility-of-the-relapsing-fever-spirochete-borrelia-miyamotoi-to-antimicrobial-agents
#12
Joris Koetsveld, Ronald O P Draga, Alex Wagemakers, Annemijn Manger, Anneke Oei, Caroline E Visser, Joppe W Hovius
Hard tick-borne relapsing fever (HTBRF) is an emerging infectious disease throughout the temperate zone caused by the relapsing fever spirochete Borrelia miyamotoi Antibiotic treatment of HTBRF is empirically based on the treatment of Lyme borreliosis, however antibiotic susceptibility of B. miyamotoi has not been studied to date. Thus, we set out to determine the in vitro antimicrobial susceptibility of B. miyamotoiA microdilution method with 96-well microtiter plates was used to determine antibiotic susceptibility of two B...
July 3, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28673597/infections-caused-by-resistant-organisms-could-organic-arsenic-compounds-be-an-effective-treatment
#13
Victor D Warner, Albert H Soloway
Without question one of the most important medicinal chemistry discoveries of the 20th century was made by Paul Ehrlich and his colleagues, chemist, Alfred Bertheim and bacteriologist, Sahachiro Hata. They ushered in the age of targeted chemotherapy in 1910 with the discovery of the anti-syphilitic organic arsenic agent, arsphenamine or Salvarsan (also known as 606). It was the clinical compound of choice for treating syphilis until penicillin and other antibiotics were introduced clinically in the 1940s. Yet now, more than 100years after its discovery, the precise biochemical mechanism by which this compound eliminates the syphilis spirochete in vivo from humans and animals remains unknown...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28656017/small-rnas-of-borrelia-burgdorferi-characterizing-functional-regulators-in-a-sea-of-srnas%C3%A2
#14
REVIEW
Meghan C Lybecker, D Scott Samuels
Borrelia (Borreliella) burgdorferi and closely related genospecies are the causative agents of Lyme disease, the most common tick-borne disease north of the equator. The bacterium, a member of the spirochete phylum, is acquired by a tick vector that feeds on an infected vertebrate host and is transmitted to another vertebrate during subsequent feeding by the next tick stage. The precise navigation of this enzootic cycle entails the regulation of genes required for these two host-specific phases as well as the transitions between them...
June 2017: Yale Journal of Biology and Medicine
https://www.readbyqxmd.com/read/28656008/segregation-lag-in-polyploid-cells-of-the-pathogen-genus-borrelia-implications-for-antigenic-variation%C3%A2
#15
Christopher D Crowder, Richard L Denny, Alan G Barbour
Relapsing fever agents like Borrelia hermsii undergo multiphasic antigenic variation that is attributable to spontaneous DNA non-reciprocal transpositions at a particular locus in the genome. This genetic switch results in a new protein being expressed on the cell surface, allowing cells with that phenotype to escape prevailing immunity. But the switch occurs in only one of several genomes in these spirochetes, and a newly-switched gene is effectively "recessive" until homozygosity is achieved. The longer that descendants of the switched cell expressed both old and new proteins, the longer this lineage risks neutralization by antibody to the old protein...
June 2017: Yale Journal of Biology and Medicine
https://www.readbyqxmd.com/read/28644529/reciprocal-cooperation-of-phytochemicals-and-micronutrients-against-typical-and-atypical-forms-of-borrelia-spp
#16
Anna Goc, Alexandra Niedzwiecki, Matthias Rath
AIMS: Borrelia spp., a causative pathogenic factor of Lyme disease, has become a major public health threat. Current treatments based on antibiotics often lead to relapse after their withdrawal. Naturally derived substances that could work synergistically to display higher efficacy compared to the individual components may serve as a resource for the development of novel approaches to combat both active and latent forms of Borrelia spp. METHODS AND RESULTS: Using checkerboard assay, we investigated the anti-borreliae reciprocal cooperation of phytochemicals and micronutrients against two species of Borrelia selected as prevalent causes of Lyme disease in the US and Europe...
June 23, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28634527/an-atypical-presentation-of-a-re-emerging-disease
#17
Michael Hunter, Patrick Brine
Often referred to as 'The Great Mimicker', syphilis infections have been on the rise since 2000 including cases of primary and secondary syphilis where 19,999 were reported in the USA in 2014. ​​The increase in cases has led the USPSTF to recommend screening for syphilis infection in persons who are at increased risk of infection. ​​Changes in screening and re-emergence of the disease necessitates review of the multitude of circumstances a patient can present for care. Immunocompetent patients begin to show classic symptoms within 10-90 days following infection with the spirochete...
January 2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/28619055/molecular-typing-of-leptospira-interrogans-serovar-hardjo-isolates-from-leptospirosis-outbreaks-in-brazilian-livestock
#18
Maria Raquel V Cosate, Tetsu Sakamoto, Tiago Antônio de Oliveira Mendes, Élvio C Moreira, Carlos G Regis da Silva, Bruno S A F Brasil, Camila S F Oliveira, Vasco Ariston de Azevedo, José Miguel Ortega, Rômulo C Leite, João Paulo Haddad
BACKGROUND: Leptospirosis is caused by pathogenic spirochetes of the genus Leptospira spp. This zoonotic disease is distributed globally and affects domestic animals, including cattle. Leptospira interrogans serogroup Sejroe serovar Hardjo and Leptospira borgpetersenii serogroup Sejroe serovar Hardjo remain important species associated with this reproductive disease in livestock production. Previous studies on Brazilian livestock have reported that L. interrogans serovar Hardjo is the most prevalent leptospiral agent in this country and is related to clinical signs of leptospirosis, which lead to economic losses in production...
June 15, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28614210/congenital-syphilis-of-bone-a-potential-mimicker-of-childhood-histiocytoses
#19
Youran Zou, Matthew A Marcus, C Guy Castles, Scott E Kilpatrick
Involvement of the skeletal system by congenital syphilis is well documented in the literature, chiefly in the form of radiologic studies, including periostitis, osteitis, and osteochondritis. Because congenital syphilis is generally recognized clinically, tissue biopsy is virtually never performed. Therefore, the histopathologic findings are less well documented and mostly exist in the older literature. We report herein the clinicoradiologic and pathologic features of a 2-month-old infant who initially presented with absence of left arm movement...
June 13, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28611756/pathogenic-leptospira-secreted-proteases-target-the-membrane-attack-complex-a-potential-role-for-thermolysin-in-complement-inhibition
#20
Thais A Amamura, Tatiana R Fraga, Sílvio A Vasconcellos, Angela S Barbosa, Lourdes Isaac
Leptospirosis is a zoonosis caused by spirochetes from the genus Leptospira. This disease is common in tropical and subtropical areas, constituting a serious public health problem. Pathogenic Leptospira have the ability to escape the human Complement System, being able to survive when in contact with normal human serum. In a previous study, our group demonstrated that supernatants of pathogenic Leptospira (SPL) inhibit the three activation pathways of the Complement System. This inhibition can be directly correlated with the activity of secreted proteases, which cleave the Complement molecules C3, Factor B (Alternative Pathway), C4 and C2 (Classical and Lectin Pathways)...
2017: Frontiers in Microbiology
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