Protozoan
Mostrando 37-48 de 1045 artigos, teses e dissertações.
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37. Multi-criteria decision analysis and spatial statistic: an approach to determining human vulnerability to vector transmission of Trypanosoma cruzi
BACKGROUND Chagas disease (CD), caused by the protozoan Trypanosoma cruzi, is a neglected human disease. It is endemic to the Americas and is estimated to have an economic impact, including lost productivity and disability, of 7 billion dollars per year on average. OBJECTIVES To assess vulnerability to vector-borne transmission of T. cruzi in domiciliary
Mem. Inst. Oswaldo Cruz. Publicado em: 2017-10
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38. Antidiarrheal activity of extracts from Maytenus gonoclada and inhibition of Dengue virus by lupeol
ABSTRACT Diarrhea is an infectious disease caused by bacterial, virus, or protozoan, and dengue is caused by virus, included among the neglected diseases in several underdeveloped and developing countries, with an urgent demand for new drugs. Considering the antidiarrheal potential of species of Maytenus genus, a phytochemical investigation followed by antib
An. Acad. Bras. Ciênc.. Publicado em: 2017-09
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39. The influence of serial fecal sampling on the diagnosis of giardiasis in humans, dogs, and cats
ABSTRACT Giardia infection is a common clinical problem in humans and pets. The diagnosis of giardiasis is challenging as hosts intermittently excrete protozoan cysts in their feces. In the present study, we comparatively evaluated two methods of serial fecal sampling in humans, dogs, and cats from Rio de Janeiro, Brazil. The Faust et al. technique was used
Rev. Inst. Med. trop. S. Paulo. Publicado em: 24/08/2017
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40. Enveloped and non-enveloped viral-like particles in Trypanosoma cruzi epimastigotes
ABSTRACT Electron microscopy is routinely used to identify viral infections in protozoan parasites. These viruses have been described as non-enveloped and icosahedral structures with a diameter of 30-60 nm. Most of them are classified within the non-segmented dsRNA Totiviridae family. We observed virus-like particles (VLPs) through transmission electron micr
Rev. Inst. Med. trop. S. Paulo. Publicado em: 07/08/2017
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41. Bone marrow cell migration to the heart in a chimeric mouse model of acute chagasic disease
BACKGROUND Chagas disease is a public health problem caused by infection with the protozoan Trypanosoma cruzi. There is currently no effective therapy for Chagas disease. Although there is some evidence for the beneficial effect of bone marrow-derived cells in chagasic disease, the mechanisms underlying their effects in the heart are unknown. Reports have
Mem. Inst. Oswaldo Cruz. Publicado em: 2017-08
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42. Identification of a type I nitroreductase gene in non-virulent Trypanosoma rangeli
ABSTRACT Trypanosomatid type I nitroreductases (NTRs), i.e., mitochondrial enzymes that metabolise nitroaromatic pro-drugs, are essential for parasite growth, infection, and survival. Here, a type I NTR of non-virulent protozoan Trypanosoma rangeli is described and compared to those of other trypanosomatids. The NTR gene was isolated from KP1(+) and KP1(-) s
Mem. Inst. Oswaldo Cruz. Publicado em: 2017-07
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43. The performance of serological tests for Leishmania infantum infection screening in dogs depends on the prevalence of the disease
ABSTRACT Dogs are considered the main reservoir of Leishmania infantum. This protozoan causes visceral leishmaniasis (VL), an uncontrolled urban zoonosis in Brazil. Serological tests and polymerase chain reaction (PCR) on peripheral blood were performed to identify infected dogs in scenarios of higher and lower prevalence of the disease (Teresina and Vitóri
Rev. Inst. Med. trop. S. Paulo. Publicado em: 01/06/2017
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44. Phenotypic diversity and selection maintain Leishmania amazonensis infectivity in BALB/c mouse model
Leishmania are protozoan parasites that show remarkable diversity, as revealed by the various clinical forms of leishmaniasis, which can range from mild skin lesions to severe metastatic cutaneous/mucosal lesions. The exact nature and extent of Leishmania phenotypic diversity in establishing infection is not fully understood. In order to try to understand so
Mem. Inst. Oswaldo Cruz. Publicado em: 2017-01
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45. Aptamers as a promising approach for the control of parasitic diseases
ABSTRACT Aptamers are short single-stranded RNA or DNA oligonucleotides that are capable of binding various biological targets with high affinity and specificity. Their identification initially relies on a molecular process named SELEX (Systematic Evolution of Ligands by EXponential enrichment) that has been later modified in order to improve aptamer sensiti
Braz J Infect Dis. Publicado em: 2016-12
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46. Is chronic toxoplasmosis a risk factor for diabetes mellitus? A systematic review and meta-analysis of case-control studies
ABSTRACT Introduction: The global protozoan parasite, Toxoplasma gondii, infects many warm-blooded animals and humans by employing different transmission routes. There have been some recent studies on the probable relevance of infectious agents and diabetes. Therefore, we conducted a systematic review and meta-analysis to identify the possible association b
Braz J Infect Dis. Publicado em: 2016-12
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47. Asymptomatic infection with American cutaneous leishmaniasis: epidemiological and immunological studies
American cutaneous leishmaniasis (ACL) is a major public health problem caused by vector-borne protozoan intracellular parasites from the genus Leishmania, subgenera Viannia and Leishmania. Asymptomatic infection is the most common outcome after Leishmania inoculation. There is incomplete knowledge of the biological processes explaining the absence of signs
Mem. Inst. Oswaldo Cruz. Publicado em: 2016-10
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48. Parasites of two coexisting invasive sailfin catfishes (Siluriformes: Loricariidae) in a tropical region of Mexico
ABSTRACT Currently many species of Amazon sailfin catfishes (Loricariidae) have been introduced to wild environments outside their native range. There is, however, little knowledge about their role as vectors of parasites that can infect native fish or even humans through its consumption. The aim of the present study was to determine the parasitic fauna of t
Neotrop. ichthyol.. Publicado em: 30/09/2016