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Toxoplasma gondii

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https://www.readbyqxmd.com/read/28920819/disseminated-toxoplasmosis-in-a-captive-adult-dromedary-camel-camelus-dromedarius
#1
Jennifer Riley, Michael M Garner, Matti Kiupel, Elizabeth E Hammond
An 11-yr-old dromedary camel (Camelus dromedarius) at a zoo in south Florida presented with diarrhea while being treated with enrofloxacin and dexamethasone for a chronic skin condition. Three weeks after initiation of therapy with dexamethasone, the camel developed diarrhea, which worsened despite treatment with antibiotics. The animal became increasingly debilitated, developed hemorrhagic diarrhea, declined rapidly over the next 3 days, and died despite aggressive fluid therapy and supportive care. Histologic examination revealed intralesional protozoal tissue cysts consistent with Toxoplasma gondii in the intestines, lungs, and liver, as well as lymphoid depletion of the spleen suggesting immunosuppression...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28920810/newly-described-toxoplasma-gondii-strain-causes-high-mortality-in-red-necked-wallabies-macropus-rufogriseus-in-a-zoo
#2
Amanda Guthrie, Leah Rooker, Rommel Tan, Richard Gerhold, Karen Trainor, Tiantian Jiang, Chunlei Su
This manuscript describes an outbreak of fatal toxoplasmosis in wallabies. Ten adult red necked wallabies (Macropus rufogriseus) were imported from New Zealand to the Virginia Zoo. Agglutination testing upon admission into quarantine showed all animals to be negative for antibodies to Toxoplasma gondii. Nine of these wallabies died from acute toxoplasmosis within 59-565 (average 224) days after being moved onto exhibit. Clinical signs included lethargy, diarrhea, tachypnea, and ataxia that progressed rapidly; death without premonitory signs occurred in one case...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28919691/molecular-etiopathology-of-naturally-occurring-reproductive-diseases-in-female-goats
#3
V Beena, R V S Pawaiya, K Gururaj, D D Singh, A K Mishra, N K Gangwar, V K Gupta, R Singh, A K Sharma, M Karikalan, Ashok Kumar
AIM: The aim of the present study was to investigate the molecular etiopathology of occurrence of reproductive diseases in female goats. Reproductive diseases in goats account for major economic losses to goat farmers in terms of valuable loss of offspring and animal productivity. MATERIALS AND METHODS: A total of 660 female genitalia were examined for pathological conditions (macroscopic and microscopic lesions). The etiopathological study was carried out for the presence of pathogenic organisms such as Brucella, Chlamydia, and Campylobacter in the uterus and ovary...
August 2017: Veterinary World
https://www.readbyqxmd.com/read/28917322/high-genetic-diversity-in-toxoplasma-gondii-isolates-from-pigs-at-slaughterhouses-in-para%C3%A3-ba-state-northeastern-brazil-circulation-of-new-genotypes-and-brazilian-clonal-lineages
#4
Thais Ferreira Feitosa, Vinícius Longo Ribeiro Vilela, João Leite de Almeida-Neto, Antonielson Dos Santos, Dayana Firmino de Morais, Bruna Farias Alves, Fabiana Nakashima, Solange Maria Gennari, Ana Célia Rodrigues Athayde, Hilda Fátima Jesus Pena
The consumption of raw or undercooked pig meat containing Toxoplasma gondii cysts is an important transmission route of this protozoon to animals and humans. This study aimed to serologically diagnose, isolate and genotype T. gondii from pigs slaughtered for human consumption in the state of Paraíba, northeastern Brazil. Blood and tissue samples (heart, tongue and brain) were collected from 120 pigs at slaughterhouses in the state of Paraíba. Serological examinations were performed with an indirect immunofluorescent antibody test (IFAT) with a cut-off point of 1:64...
September 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28917307/evaluation-of-western-blot-elisa-and-latex-agglutination-tests-to-detect-toxoplasma-gondii-serum-antibodies-in-farmed-red-deer
#5
Kandarp Khodidas Patel, Laryssa Howe, Cord Heuer, Geoffery William Asher, Peter Raymond Wilson
Abortion due to Toxoplasma gondii has been suspected in New Zealand farmed red deer. However, knowledge around the epidemiology and prevalence of T. gondii in farmed red deer is limited. The aim of this study was to firstly, assess the sensitivity and specificity of two commercially available assays, ELISA and latex agglutination test (LAT), for use in deer and secondly, to estimate the sero-prevalence of T. gondii in red deer. A total of 252 sera from rising 2-year-old and adult hinds from 17 New Zealand red deer herds at early and late pregnancy scanning and from known aborted and/or non-aborted hinds were tested for the presence of T...
September 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28917302/the-global-seroprevalence-of-toxoplasma-gondii-among-wild-boars-a-systematic-review-and-meta-analysis
#6
Ali Rostami, Seyed Mohammad Riahi, Yadollah Fakhri, Vafa Saber, Hooman Hanifehpour, Soghra Valizadeh, Majid Gholizadeh, Rokhsane Hosseini Pouya, H Ray Gamble
This systematic review and meta-analysis study was performed to evaluate the worldwide seroprevalence of Toxoplasma gondii among wild boar. We searched PubMed, Science Direct, Web of Science, Cochrane, Scopus, EBSCOhost and Google Scholar databases for studies reporting T. gondii seroprevalence in wild boars between January 1995 and March 2017. Inclusion and exclusion criteria were applied. We estimated the pooled seroprevalence of T. gondii in wild boars using a random-effects model, and evaluated overall seroprevalence in different geographical areas...
September 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28914186/viral-and-parasitic-pathogen-burden-and-the-association-with-stroke-in-a-population-based-cohort
#7
Brad D Pearce, Anna Bracher, Jeffrey L Jones, Deanna Kruszon-Moran
Background Higher cumulative burden of viral and bacterial pathogens may increase the risk of stroke, but the contribution of parasitic infections in relation to cumulative pathogen burden and risk of stroke has rarely been examined. Aim To estimate the association of multiple persistent viral and parasitic infections with stroke in a representative sample of adults in the United States. Methods Serological evidence of prior infection was categorized as positive for 0-1, 2, 3, or 4-5 infections based on immunoglobulin G seropositivity to cytomegalovirus, hepatitis A virus, hepatitis B virus, Toxoplasma gondii, and Toxocara spp...
January 1, 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/28911798/development-and-evaluation-of-multiplex-real-time-pcr-for-diagnosis-of-hsv-1-vzv-cmv-and-toxoplasma-gondii-in-patients-with-infectious-uveitis
#8
Archit Kumar, Mini P Singh, Reema Bansal, Amod Gupta, Jagat Ram, Radha Kanta Ratho
Infectious uveitis is a vision threatening inflammatory ocular disease wherein early diagnosis may prevent the loss of vision. The purpose of this study was to develop a multiplex real-time PCR for the diagnosis of Herpes simplex virus-1, Varicella zoster virus, cytomegalovirus and Toxoplasma gondii in patients with suspected infectious uveitis. A total of 126 intraocular samples (aqueous and vitreous humor) were collected and subjected to multiplex real-time PCR. Overall 26.2% (33/126) patients were found to be positive for one or more of the pathogens tested...
August 9, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28910406/cancer-therapy-in-a-microbial-bottle-uncorking-the-novel-biology-of-the-protozoan-toxoplasma-gondii
#9
Barbara A Fox, Kiah L Butler, Rebekah B Guevara, David J Bzik
No abstract text is available yet for this article.
September 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28904337/toxoplasma-modulates-signature-pathways-of-human-epilepsy-neurodegeneration-cancer
#10
Huân M Ngô, Ying Zhou, Hernan Lorenzi, Kai Wang, Taek-Kyun Kim, Yong Zhou, Kamal El Bissati, Ernest Mui, Laura Fraczek, Seesandra V Rajagopala, Craig W Roberts, Fiona L Henriquez, Alexandre Montpetit, Jenefer M Blackwell, Sarra E Jamieson, Kelsey Wheeler, Ian J Begeman, Carlos Naranjo-Galvis, Ney Alliey-Rodriguez, Roderick G Davis, Liliana Soroceanu, Charles Cobbs, Dennis A Steindler, Kenneth Boyer, A Gwendolyn Noble, Charles N Swisher, Peter T Heydemann, Peter Rabiah, Shawn Withers, Patricia Soteropoulos, Leroy Hood, Rima McLeod
One third of humans are infected lifelong with the brain-dwelling, protozoan parasite, Toxoplasma gondii. Approximately fifteen million of these have congenital toxoplasmosis. Although neurobehavioral disease is associated with seropositivity, causality is unproven. To better understand what this parasite does to human brains, we performed a comprehensive systems analysis of the infected brain: We identified susceptibility genes for congenital toxoplasmosis in our cohort of infected humans and found these genes are expressed in human brain...
September 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28904126/nlrp3-and-potassium-efflux-drive-rapid-il-1%C3%AE-release-from-primary-human-monocytes-during-toxoplasma-gondii-infection
#11
Lanny Gov, Christine A Schneider, Tatiane S Lima, William Pandori, Melissa B Lodoen
IL-1β is produced by myeloid cells and acts as a critical mediator of host defense during infection and injury. We found that the intracellular protozoan parasite Toxoplasma gondii induced an early IL-1β response (within 4 h) in primary human peripheral blood monocytes isolated from healthy donors. This process involved upregulation of IL-1β, IL-1RN (IL-1R antagonist), and NLRP3 transcripts, de novo protein synthesis, and the release of pro- and mature IL-1β from infected primary monocytes. The released pro-IL-1β was cleavable to mature bioactive IL-1β in the extracellular space by the protease caspase-1...
September 13, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28902298/nursing-infant-with-acquired-toxoplasmosis-in-the-first-months-of-life-a-case-report
#12
Hanstter Hallison Alves Rezende, Heloísa Ribeiro Storchilo, Jaqueline Ataíde Silva Lima, Antônio Roberto Gomes, Taynara Cristina Gomes, Jéssica Yonara de Souza, Mariza Martins Avelino, Waldemar Naves do Amaral, Marina Clare Vinaud, Ana Maria de Castro
Toxoplasmosis is caused by Toxoplasma gondii and the probability of this infection occurring in the first months of life is usually low because its transmission is related to eating habits. A 6-month-old nursing infant was diagnosed with acute toxoplasmosis, which was identified through anti- T. gondii IgA, IgM and low-avidity IgG serologic assays, polymerase chain reaction (PCR) and mouse bioassay test although its mother was seronegative. This serological divergence between mother and child led us to interview the mother regarding epidemiological factors...
August 24, 2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28899692/in-vitro-efficacy-of-bumped-kinase-inhibitors-against-besnoitia-besnoiti-tachyzoites
#13
Alejandro Jiménez-Meléndez, Kayode K Ojo, Alexandra M Wallace, Tess R Smith, Andrew Hemphill, Vreni Balmer, Javier Regidor-Cerrillo, Luis M Ortega-Mora, Adrian B Hehl, Erkang Fan, Dustin J Maly, Wesley C Van Voorhis, Gema Álvarez-García
Besnoitia besnoiti is an apicomplexan parasite responsible for bovine besnoitiosis, a chronic and debilitating disease that causes systemic and skin manifestations and sterility in bulls. Neither treatments nor vaccines are currently available. In the search for therapeutic candidates, calcium-dependent protein kinases have arisen as promising drug targets in other apicomplexans (e.g. Neospora caninum, Toxoplasma gondii, Plasmodium spp. and Eimeria spp.) and are effectively targeted by bumped kinase inhibitors...
September 9, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28898199/a-druggable-secretory-protein-maturase-of-toxoplasma-essential-for-invasion-and-egress
#14
Sunil Kumar Dogga, Budhaditya Mukherjee, Damien Jacot, Tobias Kockmann, Luca Molino, Pierre-Mehdi Hammoudi, Ruben C Hartkoorn, Adrian B Hehl, Dominique Soldati-Favre
Micronemes and rhoptries are specialized secretory organelles that deploy their contents at the apical tip of apicomplexan parasites in a regulated manner. The secretory proteins participate in motility, invasion, and egress and are subjected to proteolytic maturation prior to organellar storage and discharge. Here we establish that Toxoplasma gondii aspartyl protease 3 (ASP3) resides in the endosomal-like compartment and is crucially associated to rhoptry discharge during invasion and to host cell plasma membrane lysis during egress...
September 12, 2017: ELife
https://www.readbyqxmd.com/read/28895246/influence-of-indigenous-microbiota-on-experimental-toxoplasmosis-in-conventional-and-germ-free-mice
#15
Bruna B Nascimento, Christiane T Cartelle, Maria de L Noviello, Breno V Pinheiro, Ricardo W de Almeida Vitor, Danielle da G Souza, Simone de Vasconcelos Generoso, Valbert N Cardoso, Flaviano Dos S Martins, Jacques R Nicoli, Rosa M E Arantes
Toxoplasmosis represents one of the most common zoonosis worldwide. Its agent, Toxoplasma gondii, causes a severe innate pro-inflammatory response. The indigenous intestinal microbiota promotes host animal homoeostasis and may protect the host against pathogens. Germ-free (GF) animals provide an important tool for the study of interactions between host and microbiota. In this study, we assessed the role of indigenous microorganisms in disease development utilizing a murine toxoplasmosis model, which includes conventional (CV) and GF NIH Swiss mice...
September 11, 2017: International Journal of Experimental Pathology
https://www.readbyqxmd.com/read/28893913/il17a-deficient-mice-are-highly-susceptible-to-toxoplasma-gondii-infection-due-to-excessively-induced-t-gondii-hsp70-and-ifn-%C3%AE-production
#16
Masataka Moroda, Masaya Takamoto, Yoichiro Iwakura, Jun Nakayama, Fumie Aosai
IL-17A is known to be involved in the host defense against pathogens and pathogenesis of autoimmune diseases. Previously, we showed that excessive IFN-γ plays an important role in the pathogenesis of lethal effect of Toxoplasma gondii (T. gondii) by inducing anaphylactic responses. In this report, we examine the effects of an IL-17A deficiency on murine host defense against oral T. gondii infection. IL-17A-deficient C57BL/6 (B6) mice exhibited higher mortality than wild type (WT) mice to T. gondii at the acute phase of infection...
September 11, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28892190/parasitemia-due-to-sarcocystis-neurona-like-infection-in-a-clinically-ill-domestic-cat
#17
Nina C Zitzer, Antoinette E Marsh, Mary Jo Burkhard, M Judith Radin, Maxey L Wellman, Maria Jugan, Valerie Parker
An 8-year-old, 6-kg, male neutered Domestic Shorthair cat was presented to The Ohio State University Veterinary Medical Center (OSU-VMC) for difficulty breathing. Physical examination and thoracic radiographs indicated pneumonia, a soft-tissue mass in the left caudal lung lobe, and diffuse pleural effusion. The effusion was classified as modified transudate. Rare extracellular elongated (~5-7 μm × 1-2 μm) zoites with a central round to oval-shaped purple to deep purple vesicular nucleus with coarsely stippled chromatin and light blue cytoplasm were seen on a peripheral blood smear...
September 11, 2017: Veterinary Clinical Pathology
https://www.readbyqxmd.com/read/28887145/role-of-an-estradiol-regulatory-factor-hydroxysteroid-dehydrogenase-hsd-in-toxoplasma-gondii-infection-and-pathogenicity
#18
Xiao Zhang, Jing Liu, Muzi Li, Yong Fu, Taotao Zhang, Qian Han, Qun Liu
Toxoplasma gondii is an apicomplexan parasite that infects most species of warm-blooded animals, including humans, and causes abortions and severe damage to the fetal central nervous system. During pregnancy, the prevalence of toxoplasmosis increases throughout the second and third quarter of gestation, while the hormones progesterone and estradiol simultaneously increase. Thus, it has been suggested that these hormones could affect parasite reproduction. This study was mainly focused on an estradiol regulatory factor-Hydroxysteroid dehydrogenase (HSD) gene in T...
September 5, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28886182/toxoplasma-gondii-seroprevalence-varies-by-cat-breed
#19
Kärt Must, Marjo K Hytönen, Toomas Orro, Hannes Lohi, Pikka Jokelainen
Toxoplasma gondii is a widespread zoonotic parasite that is relevant for veterinary and public health. The domestic cat, the definitive host species with the largest worldwide population, has become evolutionarily and epidemiologically the most important host of T. gondii. The outcome of T. gondii infection is influenced by congenital and acquired host characteristics. We detected differences in T. gondii seroprevalence by cat breed in our previous studies. The aims of this study were to estimate T. gondii seroprevalence in selected domestic cat breeds, and to evaluate whether being of a certain breed is associated with T...
2017: PloS One
https://www.readbyqxmd.com/read/28883820/decidual-macrophage-functional-polarization-during-abnormal-pregnancy-due-to-toxoplasma-gondii-role-for-lilrb4
#20
Zhidan Li, Mingdong Zhao, Teng Li, Jing Zheng, Xianbing Liu, Yuzhu Jiang, Haixia Zhang, Xuemei Hu
During gestation, Toxoplasma gondii infection produces a series of complications including stillbirths, abortions, and congenital malformations. The inhibitory receptor, LILRB4, which is mainly expressed by professional antigen-presenting cells (especially macrophages and dendritic cells) may play an important immune-regulatory role at the maternal-fetal interface. To assess the role of LILRB4 during T. gondii infection, LILRB4(-/-) and T. gondii infected pregnant mouse models were established. Further, human primary-decidual macrophages were treated with anti-LILRB4 neutralizing antibody and then infected with T...
2017: Frontiers in Immunology
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