Papers by Hudson dos Santos
Revista Brasileira de Parasitologia Veterinária, 2020
Currently, there are 21 species of Angiostrongylus that parasitize the pulmonary or mesenteric ar... more Currently, there are 21 species of Angiostrongylus that parasitize the pulmonary or mesenteric arteries of wild and domestic rodents, felids, canids and human. Species of Angiostrongylus have cosmopolitan distribution covering tropical, subtropical and temperate regions. The procyonid Nasua nasua (coati) is a reservoir host for a wide variety of parasites that may be harmful to its populations or may contain etiological agents with zoonotic potential. In urban areas, coatis are usually found in close association with humans and domestic animals. We morphologically and molecularly characterized a new species of Angiostrongylus found in N. nasua in a protected area within Belo Horizonte, Brazil. The new species of Angiostrongylus differs from other species of the same genus in terms of the length and bifurcation level of the lateral and ventral rays, the length of spicules and female tail morphology. Molecular phylogenetic results based on the mitochondrial cytochrome c oxidase subuni...
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Revista do Instituto de Medicina Tropical de São Paulo, 2015
SUMMARY Cestodes of the Bertiella genus are parasites of non-human primates found in Africa, Asia... more SUMMARY Cestodes of the Bertiella genus are parasites of non-human primates found in Africa, Asia, Oceania and the Americas. Species Bertiella studeri and Bertiella mucronatacould, accidentally, infect human beings. The infection occurs from ingestion of mites from the Oribatida order containing cysticercoid larvae of the parasite. The objective of this report is to register the first case of human infection by Bertiella studeri in Brazil. Proglottids of the parasite, found in the stool sample of a two-and-a-half-year-old child, were fixed, stained and microscopically observed to evaluate its morphological characteristics. Eggs obtained from the proglottids were also studied. The gravid proglottids examined matched the description of the genus Bertiella. The eggs presented a round shape, with the average diameter of 43.7 µm, clearly showing the typical pyriform apparatus of B. studeri. The authors concluded that the child was infected with Bertiella studeri,based on Stunkard's (...
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According to several authors from our conuntry, the greatest copropatological research were made ... more According to several authors from our conuntry, the greatest copropatological research were made up to the 70's. In the last few years, science has counted only on isolated works that cannot be compared to each other due to geographic, social, economic and cultural diversity in the country. Since intestine parasites are a severe problem to public health, they are very important to the world and they also contribute to make economic, social and medical problems even bigger in the trhird world. Besides evaluating the existence of parasites, it is our intention to relate its frequency to basic health conditions at varied spots within the area where the Centro de Saúde Cícero Idelfonso of the west region of the city council of Belo Horizonte, Minas Gerais is located.
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Parasitology Research, 2014
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Veterinary Parasitology, 2014
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Veterinary Parasitology, 2006
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Research in Veterinary Science, 2007
In a previous work Ancylostoma caninum sex-specific genes had being identified, however without c... more In a previous work Ancylostoma caninum sex-specific genes had being identified, however without confirmation, by using an non specific RT-PCR comparing male and female cDNA. In this work more fragments had been identified and a semi-quantitative RT-PCR carried out in order to confirm the sex-specific character of the transcripts obtained. Four fragments were confirmed as sex-specific or as being expressed more in one sex than the other.
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Journal of Wildlife Diseases, 2012
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Annals of the New York Academy of Sciences, 2004
Recombinant DNA studies have been focused on developing vaccines to different cestodes. But few s... more Recombinant DNA studies have been focused on developing vaccines to different cestodes. But few studies involving Dipylidium caninum molecular biology and genes have been done. Only partial sequences of mitochondrial DNA and ribosomal RNA gene are available in databases. Any molecular work with this parasite, including epidemiology, study of drug-resistant strains, and vaccine development, is hampered by the lack of knowledge of its genome. Thus, the knowledge of specific genes of different developmental stages of D. caninum is crucial to locate potential targets to be used as candidates to develop a vaccine and/or new drugs against this parasite. Here we report, for the first time, the sequencing of a fragment of a D. caninum expressed gene.
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Annals of the New York Academy of Sciences, 2004
The hookworm Ancylostoma canium represents a serious health problem, not only for animals but als... more The hookworm Ancylostoma canium represents a serious health problem, not only for animals but also for humans. These blood-feeding parasites produce various proteolytic enzymes in order to digest the host hemoglobin. The female worm ingests more blood than does the male. It is not known whether this difference is accompanied by expression of sex-specific proteinases. The identification of new genes related either to the developmental process of maturation of each sex or to the proteinases secreted by these worms could provide researchers with new tools to be used in control programs for this important parasite. The differential-display technique was used to compare the gene expression patterns of adult male and female worms in order to find specific genes that could be used as new targets in the control strategies for this parasite.
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International Journal for Parasitology: Parasites and Wildlife, 2016
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Parasitology Research, 2013
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Revista Brasileira de Parasitologia Veterinária, 2014
The present study details the pathological and parasitological findings of parasitic ventriculiti... more The present study details the pathological and parasitological findings of parasitic ventriculitis and nematode infections in the large intestines of two female Rhea americana americana birds. The birds were housed in captivity, and both exhibited poor body condition and lethargy. The rheas were sent to the Veterinary Hospital of the Veterinary School, Universidade Federal de Minas Gerais (UFMG) and, despite medical care, the clinical condition of the birds did not improve. The birds died two days after admission, and were submitted to necropsy. Gross, histopathology and parasitological analysis resulted in the identification of Sicarius uncinipenis, which is associated with parasitic ventriculitis, while Deletrocephalus cesarpintoi was identified in the large intestine of both rheas. The apparent clinical indications, including loss of appetite and death, combined with the discovery of numerous parasites and other pathology changes, supported the conclusion that the death of the bi...
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Trajetória e pesquisa nas ciências farmacêuticas
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Revista Brasileira de Parasitologia Veterinária, 2012
Over recent decades, diseases have been shown to be important causes of extinctions among wild sp... more Over recent decades, diseases have been shown to be important causes of extinctions among wild species. Greater emphasis has been given to diseases transmitted by domestic animals, which have been increasing in numbers in natural areas, along with human populations. This study had the aim of investigating the presence of intestinal helminths in wild canids (maned wolf, Chrysocyon brachyurus, and crab-eating fox, Cerdocyon thous) in the Serra do Cipó National Park (43-44º W and 19-20º S) and endo and ectoparasites of domestic dogs in the Morro da Pedreira Environmental Protection Area (an area surrounding the National Park). The Serra do Cipó is located in the state of Minas Gerais, Brazil. Among the enteroparasites found in domestic and wild canids, the following taxons were identified: Ancylostomidae, Trichuridae, Toxocara sp., Spirocerca sp., Physaloptera sp., Strongyloides sp., Cestoda, Dipylidium caninum, Diphyllobothriidae, Hymenolepidae, Anoplocephalidae, Trematoda, Acanthocep...
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Parasitology Research, 2013
This study compared the course of infection by Ancylostoma caninum and Ancylostoma braziliense in... more This study compared the course of infection by Ancylostoma caninum and Ancylostoma braziliense in mixed-breed dogs infected with L3 larvae. Dogs infected with A. caninum eliminated more eggs than did those infected with A. braziliense. A total of 38 % of A. caninum and 44 % of A. braziliense larvae were recovered as adult worms. There were no marked clinical abnormalities in dogs with either infection. A. caninum was associated with anemia and an increased number of circulating neutrophils, whereas infection with A. braziliense led to a decrease in the number of leukocytes. The humoral response against excreted and secreted antigens from adult worms was more sensitive and specific than the response induced with the crude antigen. No immune response was observed for either crude or excreted-secreted (ES) antigens from larvae of either species. A nonspecific response against the crude antigen of A. braziliense was found at 0 and 7 days postinfection and maintained throughout the infection period. However, antibody titers against ES antigens were elevated in A. caninum infection at patency and death, showing that this antigen has a higher specificity. The immune response elicited by infection with A. braziliense in dogs has not been described previously. No significant differences were observed in the infection processes of the two Ancylostoma species, except for the higher number of eggs eliminated from dogs infected with A. caninum, which may indicate a better evolutionary adaptation of the parasite to its host in comparison with A. braziliense.
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Revista do Instituto de Medicina Tropical de São Paulo, 2015
Cestodes of the Bertiella genus are parasites of non-human primates found in Africa, Asia, Oceani... more Cestodes of the Bertiella genus are parasites of non-human primates found in Africa, Asia, Oceania and the Americas. Species Bertiella studeri and Bertiella mucronatacould, accidentally, infect human beings. The infection occurs from ingestion of mites from the Oribatida order containing cysticercoid larvae of the parasite. The objective of this report is to register the first case of human infection by Bertiella studeri in Brazil. Proglottids of the parasite, found in the stool sample of a two-and-a-half-year-old child, were fixed, stained and microscopically observed to evaluate its morphological characteristics. Eggs obtained from the proglottids were also studied. The gravid proglottids examined matched the description of the genus Bertiella. The eggs presented a round shape, with the average diameter of 43.7 µm, clearly showing the typical pyriform apparatus of B. studeri. The authors concluded that the child was infected with Bertiella studeri,based on Stunkard's (1940) description of the species. This is the fifth case of human Bertiellosis described in Brazil through morphometric analysis of the parasite, the third in Minas Gerais State and the first diagnosed case of Bertiella studeriin Brazil.
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Annals of the New York Academy of Sciences, 2004
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Parasitology Research, 2014
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Papers by Hudson dos Santos