Teses em Doenças Tropicais (Doutorado) - PPGDT/NMT
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/3560
O Doutorado Acadêmico em Doenças Tropicais iniciou em 2007 e pertence ao Programa de Pós-Graduação em Doenças Tropicais do Núcleo de Medicina Tropical (NMT) da Universidade Federal do Pará (UFPA).
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Navegando Teses em Doenças Tropicais (Doutorado) - PPGDT/NMT por Orientadores "SOUSA, Rita Catarina Medeiros"
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Item Acesso aberto (Open Access) Caracterização genotípica do Vírus Varicela-Zoster em casos de varicela e Herpes zoster em Belém-Pará, Brasil(Universidade Federal do Pará, 2013) COSTA, Marcos Rogério Menezes da; MONTEIRO, Talita Antônia Furtado; http://lattes.cnpq.br/4592027736583434; SOUSA, Rita Catarina Medeiros; http://lattes.cnpq.br/3560941703812539Varicella zoster virus (VZV) can cause chickenpox during primary infection, subsequently establishing a latent infection. In case of reactivation of the virus, the herpes zoster may occur. Analysis of the presence of IgG and IgM is critical to determine the prevalence of this virus in the Metropolitan Region of Belém. The study of specific nucleotide polymorphisms is used to define the genotypes of VZV. Analysis of ORFs 22, 38 and 54 identified genotypes of VZV according to the classification established in conference July 25, 2008 in Whitechapel, London / UK, where the strains of VZV detected and characterized by sequencing of SNPs were grouped into classes 1 through 5. To evaluate the prevalence of antibodies and describe the circulating genotypes was the aim of this study. The frequency of IgM and IgG antibodies in cases of chickenpox was 68.2% and 48.2%, respectively. Cases of herpes zoster showed prevalence of anti-VZV IgG and IgM of 87.5% and 12.5%, respectively. The genotypes 1 or 3 and 5 were present in 13 samples sequenced, and the European strain (class 1 or 3) was found in samples from all the cities studied. The identification of strains circulating VZV is extremely important because of the association of specific genotypes with clinical harshest and to assess the implementation of the vaccine in the National Immunization Program.Item Acesso aberto (Open Access) “Citomegalovírus: diversidade genética e pesquisa de resistência antiviral em pacientes imunodeficientes da cidade de Belém”(Universidade Federal do Pará, 2015-07-17) SILVA, Dorotéa de Fátima Lobato da; SOUSA, Rita Catarina Medeiros; http://lattes.cnpq.br/3560941703812539Cytomegalovirus (CMV) is one of the most common cause of morbidity and mortality in immunocompromised patients because its latency and reactivation mechanism that commonly occurs in immunodeficiencies. Genetic analysis showed that the virulence of the strains may be related to genotypic diversity. The main objective of this paper was to describe the seroepidemiology profile and genetic diversity of CMV by detecting mutations that confer viral resistance to ganciclovir in immunodeficient patients from Belém city.A total of 671 samples were analyzed: 243 HIV/AIDS, 257 neoplastic patients, 112 kidney transplant and 60 people with SLE. The seroprevalence of antibodies was 96.1% and active infection and levels of 2.4% (n = 16) lower than that observed by qPCR method which corresponded to 15.63%. Differences in infection rates due to low sensitivity (5.71%) of the serological method demonstrated in screening test. The mutation research was made in 82 samples for pyrosequencing method, a 741pb segment of the UL97 gene was amplified, between 1087-1828 nucleotides. It was observed that 100% (n = 82) of samples had two mutations in amino acid in codon 596 (E596K) and another one in codon 604 (S604F). The S604F mutation was not found in other viral sequences from GenBank. Ten other mutations occurred between codons 377 and 594 in eight samples, including the A594V mutation in a renal transplant patient who ended up dying.It was concluded that the prevalence of antibodies and the epidemiological profile of the group were similar to those observed in populations of developing countries; the viral infection rates are related to viral reactivation, being underestimated by serology; sequence analysis revealed significant genetic diversity in the samples examined; detection of A594V mutation suggests circulating strains with resistance mutation.Item Acesso aberto (Open Access) Correlação entre o câncer bucal e de laringe e a presença do Papilomavírus Humano (HPV) e do vírus Epstein-Barr (EBV) no estado do Pará(Universidade Federal do Pará, 2013) ARAÚJO, Marizeli Viana de Aragão; FUZII, Hellen Thais; http://lattes.cnpq.br/0026958665547973; SOUSA, Rita Catarina Medeiros; http://lattes.cnpq.br/3560941703812539The oral and laryngeal cancer represents a growing public health problem in Brazil. Smoking and alcohol are the main causes of oral cancer and larynx, but a part of the population develops the disease without being exposed to these risk factors, suggesting the existence of other causes such as genetic predisposition, alteration of tumor suppressor genes, diet and viral agents, particularly human papillomavirus (HPV) and Epstein-Barr virus (EBV). The proposition of this study was to verify prevalence of HPV and EBV in normal oral mucosa, cancer of oral cavity and larynx, and what types are most prevalent in these two situations. For this study we established two groups: one consisting of 70 specimens embedded in paraffin, with a confirmed diagnosis of oral and larynx cancer and other with 166 individuals without lesions in the oral cavity. Laboratory analysis for the viral detection and typing HPV and EBV (EBV type 1 or 2) were performed by conventional PCR (Polymerase Chain Reaction). The typing of samples positive for HPV types (6, 11, 16, 18, 33, 35, 38, 52 and 58) was performed by real time PCR using probes specific for each type. The EBV and HPV prevalence found in the oral and laryngeal cancers was 78.6% for HPV and 84.3% for EBV and 24.1% and 45.8% for EBV and HPV, respectively, in individuals without oral lesions. The most prevalent HPV types were HPV 58 (50.9%), HPV 6 (9.1%) and HPV 16 (9.1%) in cancer group and HPV 18 (12.5%), HPV 6 (7.5 %) and HPV 58 (2.5%) in the group with no lesions. The EBV 2 was more prevalent in both the cancer lesions than subjects without lesions, with a frequency of 94.9% and 82.9%, respectively. There was no association of HPV infection with EBV and sex, the prevalence being similar for men and women. Association was observed between the prevalence of HPV and EBV and its co-infections with the group that developed cancer. The prevalence of HPV and EBV and the odds ratio in the occurrence of cancer was 8.86 (p <0.0001) in individuals infected with HPV and 4.08 (p = 0.0004) in patients infected by EBV. The probability value estimated for prevalence of HPV and EBV co-infection and the occurrence of cancer has shown that individuals infected by both viruses have 65.72% likelihood of developing cancer, while infected with HPV has 31.94% and infected with EBV 17.79%. The results of this study may suggest that viral agents (HPV and EBV) are important risk factors for the development of carcinogenesis, and HPV is more effective than EBV in triggering the disease.