Navegando por Autor "REZENDE, Priscila Rocha de"

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Acesso aberto (Open Access)
Carga proviral do HTLV-1 e HTLV-2: um método simples através da PCR quantitativa em tempo real
(2006-12) TAMEGÃO-LOPES, Bruna Pedroso; REZENDE, Priscila Rocha de; PEREIRA, Luciana Maria Cunha Maradei; LEMOS, José Alexandre Rodrigues de
When the human T cell lymphotropic virus (HTLV) is integrated with the host cell genome (provirus), its proviral DNA is a replication marker. Proviral load appears to be an important factor in the development of diseases related to these retroviruses. In this study, a methodology for absolute quantification of the HTLV-1 and HTLV-2 proviral load using real-time PCR was developed. Fifty-three blood donor samples with positive ELISA test result were subjected to this methodology, which utilized the TaqMan® system for three target sequences: HTLV-1, HTLV-2 and albumin. The absolute proviral load was quantified using the relative ratio between the HTLV genome and the host cell genome, taking into consideration the white blood cell count. The method presented is sensitive (215 copies/ml), practical and simple for proviral quantification, and is efficient and appropriate for confirming and discriminating infections according to viral type.
Acesso aberto (Open Access)
Distribution of hepatitis C virus genotypes among different exposure categories in the State of Pará, Brazilian Amazon
(2011-02) SAWADA, Leila; PINHEIRO, Andréia Cristina Costa; LOCKS, Daiane; PIMENTA, Adriana do Socorro Coelho; REZENDE, Priscila Rocha de; CRESPO, Deborah Maia; CRESCENTE, Jose Angelo Barletta; LEMOS, José Alexandre Rodrigues de; OLIVEIRA FILHO, Aldemir Branco de
INTRODUCTION: Epidemiological studies concerning HCV genotypic distribution in the Brazilian Amazon are scarce. Thus, this study determined the patterns of distribution of HCV genotypes among different exposure categories in the State of Pará, Brazilian Amazon. METHODS: A cross-sectional study was conducted on 312 HCV-infected individuals belonging to different categories of exposure, who were attended at the HEMOPA, CENPREN and a private hemodialysis clinic in Belém. They were tested for HCV antibodies using an immunoenzymatic test, RNA-HCV, using real-time PCR and HCV genotyping through phylogenetic analysis of the 5' UTR. The population groups were epidemiologically characterized according to data collected in a brief interview or medical consultation. RESULTS: Genotype 1 predominated in all the different categories of HCV exposure. HCV genotypic distribution among blood donors comprised genotypes 1 (94%) and 3 (6%). All patients with chronic hematologic diseases had HCV genotype 1. The genotypic distribution in illicit-drug users comprised genotypes 1 (59.6%) and 3 (40.4%). In patients under hemodialysis, genotypes 1 (90.1%), 2 (3.3%), and 3 (6.6%) were detected. Finally, the frequency of genotypes 1 and 3 was significantly different between the groups: BD and DU, PUH and DU, PUH and PCHD and PCHD and DU. CONCLUSIONS: The genotypic frequency and distribution of HCV in different categories of exposure in the State of Pará showed a predominance of genotype 1, regardless of the possible risk of infection.
Acesso aberto (Open Access)
Sensibilidade da técnica de reação em cadeia da polimerase para HIV-1 em relação à técnica de ensaio imunoenzimático
(2002-03) REZENDE, Priscila Rocha de; ALVES, Giselle Bastos; PEREIRA, Luciana Maria Cunha Maradei; VALE, Teonice Joaquina Lima; PIMENTA, Adriana do Socorro Coelho; LEMOS, José Alexandre Rodrigues de
O vírus da imunodeficiência humana (HIV) é o agente etiológico da Síndrome da Imunodeficiência Adquirida, AIDS, uma doença de grande preocupação médica. O genoma deste vírus encontra-se arranjado em nove genes individuais e por duas estruturas idênticas denominadas de repetições terminais nas extremidades 5' e 3'. Tivemos como objetivo analisar a sensibilidade do teste da reação em cadeia da polimerase (PCR) e o teste de ensaio imunoenzimático (ELISA), como teste para triagem de doadores de sangue para HIV. Foram analisadas 200 amostras de doadores e pacientes, da Fundação HEMOPA, com padrão positivo e indeterminado no teste ELISA. Na triagem sorológica pelo ELISA tiveram como resultado 35 amostras positivas, 75 amostras negativas e 90 amostras indeterminadas as quais foram submetidas ao teste pela PCR. Vinte e cinco amostras tiveram resultado positivo e 175 amostras negativas. Com estes resultados concluímos que a reação de PCR apresenta-se positiva somente nas amostras em que o teste ELISA apresenta relação DO/cutoff, acima de 3.