15 results on '"Villalobos, Iris"'
Search Results
2. Estratificación de una ciudad hiperendémica en dengue hemorrágico
- Author
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Barrera, Roberto, Delgado, Nereida, Jiménez, Matilde, Villalobos, Iris, and Romero, Ivonne
- Published
- 2000
3. Abstract 13292: Bradycardia as a Manifestation of Chikungunya Myocarditis. A New Threat to America
- Author
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Gonzalez Carta, Karina A, primary, Mendoza_Britto, Ivan J, additional, Finizola, Vicente, additional, Morr, Igor, additional, Torres, Jaime, additional, Meza, Yolimar, additional, Marquez, Juan, additional, Villalobos, Iris, additional, Vasquez, Rosalyn, additional, Chazzim, Gerardo, additional, Morr, Claudia, additional, Morr, Carlos, additional, and Mendoza, Ivan J, additional
- Published
- 2016
- Full Text
- View/download PDF
4. Abstract 12496: A New Arrhythmic Threat to America. Chikungunya Myocarditis
- Author
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Mendoza, Ivan, primary, Morr, Igor, additional, Mendoza, Ivan, additional, Torres, Jaime, additional, Gonzalez, Karina, additional, Meza, Yolimar, additional, Villalobos, Iris, additional, Marques, Juan, additional, Misticchio, Francesca, additional, Vasquez, Rosalin, additional, Morr, Carlos, additional, and Morr, Claudia, additional
- Published
- 2015
- Full Text
- View/download PDF
5. CHIKUNGUNYA MYOCARDITIS: AN EMERGING THREAT TO AMERICA
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Mendoza, Ivan, primary, Morr, Igor, additional, Mendoza, Ivan, additional, Morr, Carlos, additional, Morr, Claudia, additional, Meza, Yolimar, additional, Marques, Juan, additional, and Villalobos, Iris, additional
- Published
- 2015
- Full Text
- View/download PDF
6. Caracterización epidemiológica de los pacientes infectados por virus de hepatitis C en el estado Aragua, 2002-2007. Comité de hepatitis del estado Aragua
- Author
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De Olival, Carmen, Castillo, Sleygh, Saporitti, Rosa Maria, Zabaleta, Pablo, and Villalobos, Iris
- Subjects
HCV ,ARAGUA ,EPIDEMIOLOGY ,VHC ,EPIDEMIOLOGIA - Abstract
Venezuela presenta un subregistro de infección por VHC. Hay una prevalencia de 1,2%, demostrada en estudios aislados, 2,5% en una serie realizada en población pediátrica y 1,92% en trabajadores de salud. Se desconoce la prevalencia y características epidemiológicas de VHC en el estado Aragua. Se presenta la experiencia de 5 años del Comité de Hepatitis del Estado Aragua (CHA). Objetivos: Caracterizar epidemiológicamente la población infectada por VHC en el Estado Aragua, tomando en cuenta género, edad, estado civil, actividad laboral, antecedente de exposición ocupacional, cirugías previas, transfusiones sanguíneas, hemoderivados, procedencia, genotipo predominante, coinfección por VHB, VIH, VEB, Parvovirus B-19. Materiales y métodos: Encuesta epidemiológica a 101 pacientes con diagnóstico serológico de VHC; rango de edad, 18 - 80 años. Resultados: 60% género masculino, edad promedio 43 años ambos géneros (31,3%), 67,7% casados, provenientes en mayor porcentaje del Municipio Girardot(27,4%). En su mayoría sin profesión definida (80,2%), predominando comerciantes y obreros. De los trabajadores del sector salud (8%), 42% con antecedente de exposición ocupacional. 81,1% asintomáticos en el momento del diagnóstico y 31,8% presentó síntomas inespecíficos. 60,2% refirió cirugías previas; 29,8% transfusiones sanguíneas y, en este grupo, 49% las recibió antes de 1992. Genotipo 1 fue predominante (33,3%); sólo 8% de la población presentó coinfección por VHB, VIH, VEB o Parvovirus B-19. Conclusiones: Predominó el genero masculino, edad promedio 43 años, casados, no profesionales, 60,2% refirió cirugías previas y, en menor porcentaje (29,8%), transfusiones sanguíneas, predominó genotipo 1 y en su mayoría fueron asintomáticos. Venezuela presents a sub-record of the HCV infection. There is a prevalence of this infection of 1.2%, demonstrated in isolated studies, 2.5 % in a set made in a pediatric population, and 1.92 % in health care workers. The prevalence and epidemiologic characteristics of the HCV infection in the Aragua State are unknown. Here, it is reported the experience of the Hepatitis Committee in the Aragua State for 5 years. Objetives: Carry out the epidemiologic characterization of the HCV infected population of the Aragua State, regarding gender, age, civil status, address, job, history of occupational exposure, previous surgeries, blood transfusion, genotype of the virus, and coinfection with HBV, HIV, EBV or Parvovirus B-19. Materials and methods: Epidemiologic interview applied to 101 patients with serologic diagnosis of HCV, between 18 and 80 years old. Results: The 60 % of infected patients were males, the average age to both genders was of 43 years old (31.3 %), 67.7 % were married, mainly from the Giradot District (27.4 %). Most of this infected patients didnÊt have a specific profession (80.2 %), and consisted predominantly of traders and workers. Of the health care professionals (8 %), 42 % had history of occupational exposition. The 81.1 % of infected patients were asymptomatic at the time of the diagnosis, and 31.8 % showed unspecific symptoms. The 60.2 % had been previously subjected to surgery; 29.8 % to blood transfusion, and 49 % of the patients in this group received the transfusion before 1992. The virus genotype 1 was the predominant (33.3 %); and only 8 % of the infected population studied had coinfection with HBV, HIV,Parvovirus B-19 or EBV. Conclusions: in the infected population studied prevailed the male gender, an average age of 43 years old, the married condition, non professionals, 60.2 % reported a previous surgery, and a lower porcentage (29,8%), blood transfusions most of them were infected with genotype 1 virus and were asymptomatic.
- Published
- 2009
7. Utilización de la Reacción en Cadena de la Polimerasa para el diagnóstico de infecciones del Sistema Nervioso Central
- Author
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Zambrano, Yelitza, Chiarello, Anna, Soca, Alain, Villalobos, Iris, Marrero, Miguel, Soler, Maritza, Laferte, José, and Alvarez, Maritza
- Subjects
Polymerase Chain Reaction (PCR) ,Central Nervous System (CNS) ,Cerebrospinal fluid (CSF) ,Reacción en Cadena de la Polimerasa (PCR) ,viruses ,Líquido Cefalorraquídeo (LCR) ,Sistema Nervioso Central (SNC) - Abstract
En el presente trabajo se aplicó el ensayo de Reacción en Cadena de la Polimerasa (PCR) y sus variantes RT-PCR y Multiplex PCR para la detección de secuencias específicas de Enterovirus, Herpesvirus humanos (Virus Herpes simple y Virus Herpes tipo 6, Citomegalovirus, Epstein Barr, Varicela Zoster), Virus de Inmunodeficiencia Humana, Toxoplasma gondii, Micobacterium tuberculosis y Micoplasma pneumoniae en muestras de liquido cefalorraquídeo (LCR) de cohortes de pacientes con sospecha clínica de meningoencefalitis. De las 322 muestras de LCR procesadas, se detectaron un total de 93 muestras positivas (28,8%) para los distintos agentes infecciosos. En el grupo de pacientes con diagnóstico clínico de meningoencefalitis viral (n=212), se obtuvo un total de 73 muestras positivas (34,4%), de las cuales 37 fueron positivas a Enterovirus (50,7%), 19 a VHS (26%) y 10 pacientes (13,7%) fueron positivos a CMV. Los otros agentes virales VZV, EBV y HVH6 se encontraron en menor frecuencia. Las 110 muestras restantes de LCR se analizaron aplicando PCR específicos a cada patógeno por estricta indicación médica, pudiéndose detectar en ellas la presencia de Virus de lnmunodeficiencia Humana (40%), Micoplasma pneumoniae (40%), Toxoplasma gondii (14%) y Micobacterium tuberculosis (12%). Los resultados obtenidos en este estudio demuestran la conveniencia de la aplicación de las técnicas moleculares en el diagnóstico de laboratorio de las meningoencefalitis de diferente etiología, siendo además una herramienta muy valiosa para el manejo clínico de los pacientes y para la ejecución de estudios epidemiológicos. In the present work, the polymerase chain reaction (PCR) assay and his variants RT-PCR and Multiplex PCR were applied for the detection of specific sequences of Enterovirus, Human Herpes viruses (Herpes simple virus, Human Herpes virus type 6, Cytomegalovirus, Epstein Barr virus, and Varicella Zoster), Human Immunodeficiency virus, Toxoplasma gondii, Mycobacterium tuberculosis and Mycoplasma pneumoniae in patients’ cohorts grouped by medical suspicion of meningoencephalitis. Of 326 samples of processed cerebrospinal fluid (CSF), 93 samples (28.5 %) were positive for the different infectious agents. In the group of patients with clinical diagnosis of viral meningoencephalitis (n=212), there was obtained a whole of 73 positive samples (34.4 %), of which 37 patients were positive to Enterovirus (50.7 %), 19 were positive to VHS (26 %) and 10 patients (13. 7 %) were positive to CMV. Other viral agents as VZV, EBV and HVH6 were detected in minor frequency. The 114 remaining samples were analyzed applying specific PCR to each pathogen for strict medical indication, being able to detect the presence of Human Immunodeficiency Virus (40%), Mycoplasma pneumoniae (40%), Toxoplasma gondii (14%) and Mycobacterium tuberculosis (12%) in CSF samples. The results obtained in this study demonstrate the convenience of the application of the molecular assays in the laboratory diagnosis of the meningoencefalitis of different etiology. Besides this, it is also a very valuable tool for the clinical management of the patients and for the execution of the epidemiological studies.
- Published
- 2006
8. Utilización de la Reacción en Cadena de la Polimerasa para el Diagnóstico de Infecciones del Sistema Nervioso Central
- Author
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Zambrano, Yelitza, Chiarello, Anna, Soca, Alain, Villalobos, Iris, Marrero, Miguel, Soler, Maritza, Laferte, José, Alvarez, Maritza, Zambrano, Yelitza, Chiarello, Anna, Soca, Alain, Villalobos, Iris, Marrero, Miguel, Soler, Maritza, Laferte, José, and Alvarez, Maritza
- Abstract
En el presente trabajo se aplicó el ensayo de Reacción en Cadena de la Polimerasa (PCR) y sus variantes RT-PCR y Multiplex PCR para la detección de secuencias específicas de Enterovirus, Herpesvirus humanos (Virus Herpes simple y Virus Herpes tipo 6, Citomegalovirus, Epstein Barr, Varicela Zoster), Virus de Inmunodeficiencia Humana, Toxoplasma gondii, Micobacterium tuberculosis y Micoplasma pneumoniae en muestras de liquido cefalorraquídeo (LCR) de cohortes de pacientes con sospecha clínica de meningoencefalitis. De las 322 muestras de LCR procesadas, se detectaron un total de 93 muestras positivas (28,8%) para los distintos agentes infecciosos. En el grupo de pacientes con diagnóstico clínico de meningoencefalitis viral (n=212), se obtuvo un total de 73 muestras positivas (34,4%), de las cuales 37 fueron positivas a Enterovirus (50,7%), 19 a VHS (26%) y 10 pacientes (13,7%) fueron positivos a CMV. Los otros agentes virales VZV, EBV y HVH6 se encontraron en menor frecuencia. Las 110 muestras restantes de LCR se analizaron aplicando PCR específicos a cada patógeno por estricta indicación médica, pudiéndose detectar en ellas la presencia de Virus de lnmunodeficiencia Humana (40%), Micoplasma pneumoniae (40%), Toxoplasma gondii (14%) y Micobacterium tuberculosis (12%). Los resultados obtenidos en este estudio demuestran la conveniencia de la aplicación de las técnicas moleculares en el diagnóstico de laboratorio de las meningoencefalitis de diferente etiología, siendo además una herramienta muy valiosa para el manejo clínico de los pacientes y para la ejecución de estudios epidemiológicos
- Published
- 2009
9. Sentinel Surveillance of Influenza-Like Illness in Two Hospitals in Maracay, Venezuela: 2006–2010
- Author
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Comach, Guillermo, primary, Teneza-Mora, Nimfa, additional, Kochel, Tadeusz J., additional, Espino, Carlos, additional, Sierra, Gloria, additional, Camacho, Daria E., additional, Laguna-Torres, V. Alberto, additional, Garcia, Josefina, additional, Chauca, Gloria, additional, Gamero, Maria E., additional, Sovero, Merly, additional, Bordones, Slave, additional, Villalobos, Iris, additional, Melchor, Angel, additional, and Halsey, Eric S., additional
- Published
- 2012
- Full Text
- View/download PDF
10. Population structure of the dengue viruses, Aragua, Venezuela, 2006–2007. Insights into dengue evolution under hyperendemic transmission
- Author
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Rodriguez-Roche, Rosmari, primary, Villegas, Elci, additional, Cook, Shelley, additional, Poh Kim, Pauline A.W., additional, Hinojosa, Yoandri, additional, Rosario, Delfina, additional, Villalobos, Iris, additional, Bendezu, Herminia, additional, Hibberd, Martin L., additional, and Guzman, Maria G., additional
- Published
- 2012
- Full Text
- View/download PDF
11. Multi-Country Evaluation of the Sensitivity and Specificity of Two Commercially-Available NS1 ELISA Assays for Dengue Diagnosis
- Author
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Guzman, Maria G., primary, Jaenisch, Thomas, additional, Gaczkowski, Roger, additional, Ty Hang, Vo Thi, additional, Sekaran, Shamala Devi, additional, Kroeger, Axel, additional, Vazquez, Susana, additional, Ruiz, Didye, additional, Martinez, Eric, additional, Mercado, Juan C., additional, Balmaseda, Angel, additional, Harris, Eva, additional, Dimano, Efren, additional, Leano, Prisca Susan A., additional, Yoksan, Sutee, additional, Villegas, Elci, additional, Benduzu, Herminia, additional, Villalobos, Iris, additional, Farrar, Jeremy, additional, and Simmons, Cameron P., additional
- Published
- 2010
- Full Text
- View/download PDF
12. Utilización de la Reacción en Cadena de la Polimerasa para el diagnóstico de infecciones del Sist ma Nervioso Central.
- Author
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Zambrano, Yelitza, Chiarello, Anna, Soca, Alain, Villalobos, Iris, Marrero, Miguel, Soler, Maritza, Laferte, José, and Alvarez, Maritza
- Published
- 2006
13. Dengue Virus Structural Differences That Correlate with Pathogenesis
- Author
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Leitmeyer, Katrin C., Vaughn, David W., Watts, Douglas M., Salas, Rosalba, Villalobos, Iris, Chacon, de, Ramos, Celso, and Rico-Hesse, Rebeca
- Abstract
ABSTRACTThe understanding of dengue virus pathogenesis has been hampered by the lack of in vitro and in vivo models of disease. The study of viral factors involved in the production of severe dengue, dengue hemorrhagic fever (DHF), versus the more common dengue fever (DF), have been limited to indirect clinical and epidemiologic associations. In an effort to identify viral determinants of DHF, we have developed a method for comparing dengue type 2 genomes (reverse transcriptase PCR in six fragments) directly from patient plasma. Samples for comparison were selected from two previously described dengue type 2 genotypes which had been shown to be the cause of DF or DHF. When full genome sequences of 11 dengue viruses were analyzed, several structural differences were seen consistently between those associated with DF only and those with the potential to cause DHF: a total of six encoded amino acid charge differences were seen in the prM, E, NS4b, and NS5 genes, while sequence differences observed within the 5' nontranslated region (NTR) and 3' NTR were predicted to change RNA secondary structures. We hypothesize that the primary determinants of DHF reside in (i) amino acid 390 of the E protein, which purportedly alters virion binding to host cells; (ii) in the downstream loop (nucleotides 68 to 80) of the 5' NTR, which may be involved in translation initiation; and (iii) in the upstream 300 nucleotides of the 3' NTR, which may regulate viral replication via the formation of replicative intermediates. The significance of four amino acid differences in the nonstructural proteins NS4b and NS5, a presumed transport protein and the viral RNA polymerase, respectively, remains unknown. This new approach to the study of dengue virus genome differences should better reflect the true composition of viral RNA populations in the natural host and permit their association with pathogenesis.
- Published
- 1999
- Full Text
- View/download PDF
14. Regarding "Dengue--how best to classify it".
- Author
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Akbar NA, Allende I, Balmaseda A, Coelho IC, da Cunha RV, Datta B, Devi SS, Farrar J, Gaczkowski R, Guzman MG, Harris E, Hien TT, Horstick O, Hung NT, Jänisch T, Junghanss T, Kroeger A, Laksono IS, Lum LC, Maron GM, Martinez E, Mishra A, Ooi EE, Pleités EB, Ramirez G, Rosenberger K, Simmons CP, Siqueira JB Jr, Soria C, Tan LH, Thuy TT, Villalobos I, Villegas E, and Wills B
- Subjects
- Humans, Dengue classification
- Published
- 2012
- Full Text
- View/download PDF
15. [Use of polymerase chain reaction for the diagnosis of central nervous system infections].
- Author
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Zambrano Y, Chiarello A, Soca A, Villalobos I, Marrero M, Soler M, Laferte J, and Alvarez M
- Subjects
- Adult, Central Nervous System Infections cerebrospinal fluid, Central Nervous System Infections epidemiology, Central Nervous System Viral Diseases cerebrospinal fluid, Central Nervous System Viral Diseases diagnosis, Central Nervous System Viral Diseases epidemiology, Central Nervous System Viral Diseases virology, Cerebrospinal Fluid virology, Child, Cohort Studies, DNA, Bacterial analysis, DNA, Viral analysis, Humans, Infant, Newborn, Meningoencephalitis cerebrospinal fluid, Meningoencephalitis diagnosis, Meningoencephalitis epidemiology, Meningoencephalitis etiology, Meningoencephalitis microbiology, Middle Aged, RNA, Bacterial analysis, RNA, Viral analysis, Reverse Transcriptase Polymerase Chain Reaction, Venezuela epidemiology, Central Nervous System Infections diagnosis, Cerebrospinal Fluid microbiology, Polymerase Chain Reaction
- Abstract
In the present work, the polymerase chain reaction (PCR) assay and his variants RT-PCR and Multiplex PCR were applied for the detection of specific sequences of Enterovirus, Human Herpes viruses (Herpes simple virus, Human Herpes virus type 6, Cytomegalovirus, Epstein Barr virus, and Varicella Zoster), Human Immunodeficiency virus, Toxoplasma gondii, Mycobacterium tuberculosis and Mycoplasma pneumoniae in patients' cohorts grouped by medical suspicion of meningoencephalitis. Of 326 samples of processed cerebrospinal fluid (CSF), 93 samples (28.5%) were positive for the different infectious agents. In the group of patients with clinical diagnosis of viral meningoencephalitis (n=212), there was obtained a whole of 73 positive samples (34.4%), of which 37 patients were positive to Enterovirus (50.7%), 19 were positive to VHS (26%) and 10 patients (13.7%) were positive to CMV. Other viral agents as VZV, EBV and HVH6 were detected in minor frequency. The 114 remaining samples were analyzed applying specific PCR to each pathogen for strict medical indication, being able to detect the presence of Human Immunodeficiency Virus (40%), Mycoplasma pneumoniae (40%), Toxoplasma gondii (14%) and Mycobacterium tuberculosis (12%) in CSF samples. The results obtained in this study demonstrate the convenience of the application of the molecular assays in the laboratory diagnosis of the meningoencefalitis of different etiology. Besides this, it is also a very valuable tool for the clinical management of the patients and for the execution of the epidemiological studies.
- Published
- 2006
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