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https://www.readbyqxmd.com/read/29035867/natural-occurrence-of-microsporidia-infecting-lepidoptera-in-bulgaria
#1
Daniela Pilarska, Danail Takov, Miroslav Hyliš, Renate Radek, Ivan Fiala, Leellen Solter, Andreas Linde
We examined 34 lepidopteran species belonging to 12 families to determine presence and prevalence of microsporidian pathogens. The insects were collected from May 2009 to July 2012 from 44 sites in Bulgaria. Nosema species were isolated from Archips xylosteana, Tortrix viridana, Operophtera brumata, Orthosia cerasi, and Orthosia cruda. Endoreticulatus sp. was isolated from Eilema complana. The prevalence of all isolates in their hosts was low and ranged from 1.0% to 5.3%. Phylogenetic analyses of the new isolates based on SSU rDNA are presented...
December 20, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/29032596/limited-effect-of-adaptive-immune-response-to-control-encephalitozoonosis
#2
Bohumil Sak, Michaela Kotková, Lenka Hlásková, Martin Kváč
This study revises our understanding of the effectiveness of cell-mediated adaptive immunity and treatment against microsporidia using molecular detection and quantification of microsporidia in immunocompetent C57Bl/6 and immunodeficient CD4(-/-) and CD8(-/-) mice for the first time. We demonstrate an intense dissemination of microsporidia into most organs within the first weeks post infection in all strains of mice, followed by a chronic infection characterized by microsporidia persistence in CD4(-/-) and C57Bl/6 mice and a lethal outcome for CD8(-/-) mice...
October 15, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/29029610/infection-by-and-genotype-characteristics-of-enterocytozoon-bieneusi-in-hiv-aids-patients-from-guangxi-zhuang-autonomous-region-china
#3
Hua Liu, Zhihua Jiang, Zhongying Yuan, Jianhai Yin, Zunfu Wang, Bingxue Yu, Dongsheng Zhou, Yujuan Shen, Jianping Cao
BACKGROUND: Enterocytozoon bieneusi has been increasingly reported to infect humans and various mammals. Microsporidia cause diarrhea in HIV-infected patients worldwide. PCR amplification and sequencing based on the internal transcribed spacer region have been used to describe the genotypes of E. bieneusi and transmission of microsporidiosis. METHODS: In this study, we examined E. bieneusi infection and genotypes in HIV-positive patients in Guangxi, China. Stool specimens were collected from 285 HIV-positive patients and 303 HIV-negative individuals...
October 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29026616/first-report-of-fatal-disseminated-microsporidiosis-in-two-inland-bearded-dragons-pogona-vitticeps-in-japan
#4
Kojiro Shibasaki, Toshihiro Tokiwa, Akihiro Sukegawa, Hirotaka Kondo, Kenichi Tamukai, Yumiko Haga, Kazunori Ike
Introduction.Encephalitozoon pogonae is a newly described pathogen belonging to the phylum Microsporidia. In Austria and the USA, this species has been isolated from fatal and disseminated cases of captive-bred inland bearded dragons. Here, we report the case of fatal disseminated microsporidiosis caused by E. pogonae in two bearded dragons in Japan. Case Presentation. The two lizards from different private households in Tokyo, Japan, had been brought to an animal hospital for examination. In both cases, the animal presented with a history of weight loss for several weeks...
April 2017: JMM Case Reports
https://www.readbyqxmd.com/read/28984006/nosema-maddoxi-sp-nov-microsporidia-nosematidae-a-widespread-pathogen-of-the-green-stink-bug-chinavia-hilaris-say-and-the-brown-marmorated-stink-bug-halyomorpha-halys-st%C3%A3-l
#5
Ann E Hajek, Leellen F Solter, Joseph V Maddox, Wei-Fone Huang, Alden S Estep, Grzegorz Krawczyk, Donald C Weber, Kim A Hoelmer, Neil D Sanscrainte, James J Becnel
We describe a unique microsporidian species that infects the green stink bug, Chinavia hilaris, the brown marmorated stink bug, Halyomorpha halys, the brown stink bug, Euschistus servus, and the dusky stink bug, Euschistus tristigmus. All life stages are unikaryotic, but analysis of the consensus small subunit region of the ribosomal gene places this microsporidium in the genus Nosema, which historically has been characterized by diplokaryotic life stages. It is also characterized by having the reversed arrangement of the ribosomal gene (LSU -ITS- SSU) found in species within the "true Nosema" clade...
October 6, 2017: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/28969771/zoonotic-microsporidia-in-dogs-and-cats-in-poland
#6
Jolanta Piekarska, Marta Kicia, Maria Wesołowska, Żaneta Kopacz, Michał Gorczykowski, Barbara Szczepankiewicz, Martin Kváč, Bohumil Sak
This study investigated the prevalence, genetic diversity, and zoonotic concerns of microsporidia in household dogs and cats in Poland. A total of 126 (82 dogs and 44 cats) fecal specimens were analyzed for the presence of specific DNA of Enterocytozoon bieneusi and Encephalitozoon spp. using a nested PCR protocol amplifying the internal transcribed spacer region of the rRNA gene. Microsporidia were found in 10 (7.9%) out of the 126 examined stool samples. Of the 82 dogs, 4 (4.9%) and 2 (2.4%) were positive for E...
November 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28947404/asymptomatic-intestinal-carriage-of-microsporidia-in-hiv-positive-patients-in-tunisia-prevalence-species-and-pathogenesis
#7
S Aissa, N Chabchoub, R Abdelmalek, F Kanoun, A Goubantini, L Ammari, B Kilani, A Bouratbine, H Tiouiri-Ben Aissa, K Aoun
Asymptomatic carriage of microsporidia (ACM) has not been described in patients living with HIV (PLHIV) in Tunisia. To determine the prevalence of ACM in PLHIV followed at Tunis la Rabta hospital, describe its clinical features and course, and identify the species involved. This prospective study (2005-2009) included 71 asymptomatic PLHIV compared with 37 PLHIV with diarrhea. One stool sample per patient was examined by microscopy after Weber staining and by PCR. Species identification was confirmed by specific PCR and sequencing...
August 1, 2017: Médecine et Santé Tropicales
https://www.readbyqxmd.com/read/28944750/microsporidia-obligate-intracellular-pathogens-within-the-fungal-kingdom
#8
Bing Han, Louis M Weiss
Microsporidia are obligate intracellular pathogens related to Fungi. These organisms have a unique invasion organelle, the polar tube, which upon appropriate environmental stimulation rapidly discharges out of the spore, pierces a host cell's membrane, and serves as a conduit for sporoplasm passage into the host cell. Phylogenetic analysis suggests that microsporidia are related to the Fungi, being either a basal branch or sister group. Despite the description of microsporidia over 150 years ago, we still lack an understanding of the mechanism of invasion, including the role of various polar tube proteins, spore wall proteins, and host cell proteins in the formation and function of the invasion synapse...
April 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28942752/multiple-origins-of-parasitic-feminization-thelygeny-and-intersexuality-in-beach-hoppers-are-caused-by-paramyxid-parasites-not-microsporidia
#9
James Pickup, Joseph Edward Ironside
Within populations of the amphipod crustaceans Orchestia gammarellus and Orchestia aestuarensis, a proportion of females produce thelygenic (female-only) broods, which often contain intersexual individuals. This phenomenon is associated with the presence of two putative feminizing parasites, the paramyxid Paramarteilia orchestiae and the microsporidian Dictyocoela cavimanum, which frequently co-infect the same host. In order to determine which of the parasites causes feminization, Orchestia were resampled from the type locality of P...
September 25, 2017: Parasitology
https://www.readbyqxmd.com/read/28942047/the-course-of-infection-caused-by-encephalitozoon-cuniculi-genotype-iii-in-immunocompetent-and-immunodeficient-mice
#10
Michaela Kotková, Bohumil Sak, Lenka Hlásková, Martin Kváč
Encephalitozoon cuniculi is probably the most common microsporidia which infects a wide range of vertebrates, including human. So far, four genotypes of this parasite have been identified based on the rRNA internal transcribed spacer variations. The course of infection caused by E. cuniculi III had very massive onset in immunocompetent host characterized by the presence of this parasite in all organs and tissues within one week after peroral infection. Encephalitozoonosis caused by E. cuniculi III had very progressive spreading into all organs within first week post inoculation in immunocompromised SCID mice and led to the death of the host...
September 21, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28933049/pragmatic-combination-of-available-diagnostic-tools-for-optimal-detection-of-intestinal-microsporidia
#11
Stuti Kaushik, Rumpa Saha, Shukla Das, V G Ramachandran, Ashish Goel
Diarrhea is a debilitating condition in HIV infected individuals and with the finding that almost 1/4 cases of diarrhea in HIV are due to microsporidia, there is a dire need to institute measures for its detection on a regular basis. Keeping this in mind the study aims to determine the burden of intestinal microsporidiosis in HIV seropositive patients presenting with and without diarrhea and to compare the ability of microscopy and PCR in its detection.The study group consisted of 120 patients divided into four groups HIV seropositive with/without diarrhea, and HIV seronegative with/without diarrhea...
September 13, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28922521/molecular-and-morphological-characterization-of-anncaliia-azovica-sp-n-microsporidia-infecting-niphargogammarus-intermedius-crustacea-amphipoda-from-the-azov-sea
#12
Yuri S Tokarev, Yuliya Y Sokolova, Aleksandra A Vasilieva, Irma V Issi
Five out of one hundred adults of Niphargogammarus intermedius caught at the Azov sea shore were found to be infected with microsporidia. The infection was found in the subcuticular fat body and myocytes. Parasites developed in direct contact with host cells, displayed a disporoblastic sporogony and diplokaryotic arrangement of nuclei at all stages. Spores were oval, 4.6-5.8x2.6-3.0 μm. Exospore appendages, vesicular-tubular secretions and the anisofilar polar filament indicated a similarity to Anncaliia species...
September 18, 2017: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/28905182/effects-of-cyproterone-acetate-and-vertically-transmitted-microsporidia-parasite-on-gammarus-pulex-sperm-production
#13
Eric Gismondi, Adeline Fivet, Célia Joaquim-Justo
Endocrine disruption compounds (EDCs) and parasitism can both interfere with the reproduction process of organisms. The amphipod Gammarus pulex is the host of the vertically transmitted microsporidia Dictyocoela duebenum, and this work was devoted to the investigation of the effect of an exposure to the anti-androgen compound, cyproterone acetate (CPA), and/or of the presence of D. duebenum on the spermatozoa production and length. Significant reduction of the spermatozoa production was observed when G. pulex males were uninfected and exposed to CPA...
September 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28903465/role-of-host-cell-integrins-in-the-microsporidium-encephalitozoon-intestinalis-adherence-and-infection-in-vitro
#14
Cory A Leonard, J Russell Hayman
Microsporidia are obligate intracellular, spore-forming, fungal-related pathogens that employ a unique organelle, the polar tube, to transfer infectious spore contents into host cells to initiate infection. Spore adherence to host cells may provide the proximity required for polar tube/host cell interaction during in vivo infection. In previous in vitro studies, host sulfated glycosaminoglycans (GAGs) or recombinant microsporidia endospore protein (EnP1) was implicated in the pathogen adherence and infection process; however, complete ablation of spore adherence and infection could not be achieved, suggesting that additional or alternative spore and host cell determinants of adherence and infection may exist...
September 15, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28869156/molecular-diagnosis-of-potentially-human-pathogenic-enterocytozoon-bieneusi-and-encephalitozoon-species-in-exotic-birds-in-southwestern-iran
#15
Mehdi Tavalla, Masoumeh Mardani-Kateki, Rahman Abdizadeh, Shahrzad Soltani, Jasem Saki
Microsporidia are obligate intracellular parasites that produce spores. The infections caused by these parasites are mostly considered to be opportunistic in immunodeficient patients. Because of the zoonotic nature of microsporidia as well as the increasing prevalence of immunodeficiency diseases, the aim of this study was to evaluate the molecular diagnosis of Enterocytozoon bieneusi (E. bieneusi) and Encephalitozoon spp. in exotic birds in southwestern Iran. Initially, 816 stool specimens were collected and stained by modified trichrome (Weber) staining...
August 28, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28867932/a-dna-dot-hybridization-model-for-molecular-diagnosis-of-parasitic-keratitis
#16
Fu-Chin Huang, Hsin-Yi Hsieh, Tsung C Chang, Shu-Li Su, Shin-Ling Tseng, Yu-Hsuan Lai, Ming-Tse Kuo
PURPOSE: Developing a DNA dot hybridization model for diagnosing parasitic keratitis. METHODS: Newly designed oligonucleotide probes for detecting Acanthamoeba and microsporidia were tested with target reference strains of Acanthamoeba (n = 20) and microsporidia (n = 3), and non-target microorganisms, including bacteria (n = 20) and fungi (n = 20). These probes, which had passed the preliminary tests, were then assembled as a parasite dot hybridization (PDH) model for assessing 33 clinical samples from patients with clinically suspected Acanthamoeba and microsporidia keratitis, including eight positives for Acanthamoeba, 13 positives for microsporidia, and 12 negatives for both pathogens...
2017: Molecular Vision
https://www.readbyqxmd.com/read/28822207/response-to-comments-on-article-%C3%A2-molecular-characterizationand-phylogenetic-analysis-of-microsporidia-and-cryptosporidium-spp-in-patients-with-multiple-bowel-biopsiesfrom-fars-province-iran%C3%A2
#17
COMMENT
Iraj Mohammadpour, Farzaneh Bozorg-Ghalati, Mohammad Hossein Motazedian
No abstract text is available yet for this article.
2017: Annals of Parasitology
https://www.readbyqxmd.com/read/28819220/nosema-ceranae-fipronil-and-their-combination-compromise-honey-bee-reproduction-via-changes-in-male-physiology
#18
Guillaume Kairo, David G Biron, Faten Ben Abdelkader, Marc Bonnet, Sylvie Tchamitchian, Marianne Cousin, Claudia Dussaubat, Boris Benoit, André Kretzschmar, Luc P Belzunces, Jean-Luc Brunet
The honey bee is threatened by biological agents and pesticides that can act in combination to induce synergistic effects on its physiology and lifespan. The synergistic effects of a parasite/pesticide combination have been demonstrated on workers and queens, but no studies have been performed on drones despite their essential contribution to colony sustainability by providing semen diversity and quality. The effects of the Nosema ceranae/fipronil combination on the life traits and physiology of mature drones were examined following exposure under semi-field conditions...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818044/effects-of-the-vertically-transmitted-microsporidian-facilispora-margolisi-and-the-parasiticide-emamectin-benzoate-on-salmon-lice-lepeophtheirus-salmonis
#19
Jordan D Poley, Ben J G Sutherland, Mark D Fast, Ben F Koop, Simon R M Jones
BACKGROUND: Microsporidia are highly specialized, parasitic fungi that infect a wide range of eukaryotic hosts from all major taxa. Infections cause a variety of damaging effects on host physiology from increased stress to death. The microsporidian Facilispora margolisi infects the Pacific salmon louse (Lepeophtheirus salmonis oncorhynchi), an economically and ecologically important ectoparasitic copepod that can impact wild and cultured salmonids. RESULTS: Vertical transmission of F...
August 17, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28749993/functional-characterization-of-an-aquaporin-from-a-microsporidium-nosema-bombycis
#20
Gong Chen, Wei Wang, Hongli Chen, Weijiang Dai, Xiangran Peng, Xiaoliang Li, Xudong Tang, Li Xu, Zhongyuan Shen
Microsporidia are a diverse group of eukaryotic organisms, capable of causing parasitic infections in both vertebrates and invertebrates. During the germination process, there is an increase in the osmotic pressure of microsporidian spores. As part of this study, we cloned a homologous aquaporin gene in Nosema bombycis, and named it Nosema bombycis aquaporin (NbAQP). Sequence analysis revealed that the NbAQP contains an open reading frame with a length of 750 bp and encodes a polypeptide of 249 amino acids...
2017: PloS One
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