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1.
Braz. j. med. biol. res ; 40(3): 301-304, Mar. 2007. ilus, tab
Article in English | LILACS | ID: lil-441754

ABSTRACT

The purpose of the present study was to compare the sensitivity and specificity of V3 enzyme immunoassay (solid phase EIA and EIA inhibition) and restriction fragment length polymorphism (RFLP) with the DNA sequencing "gold standard" to identify the Brazilian HIV-1 variants of subtype B and B"-GWGR. Peripheral blood mononuclear cells were collected from 61 HIV-1-infected individuals attending a clinic in São Paulo. Proviral DNA was amplified and sequentially cleaved with the Fok I restriction enzyme. Plasma samples were submitted to a V3-loop biotinylated synthetic peptide EIA. Direct partial DNA sequencing of the env gene was performed on all samples. Based on EIA results, the sensitivity for detecting B-GPGR was 70 percent, compared to 64 percent for the Brazilian variant B"-GWGR while, the specificity of B-GPGR detection was 85 percent, compared to 88 percent for GWGR. The assessment of RFLP revealed 68 percent sensitivity and 94 percent specificity for the B-GPGR strain compared to 84 and 90 percent for the B"-GWGR variant. Moreover, direct DNA sequencing was able to detect different base sequences corresponding to amino acid sequences at the tip of the V3 loop in 22 patients. These results show a similar performance of V3 serology and RLFP in identifying the Brazilian variant GWGR. However, V3 peptide serology may give indeterminate results. Therefore, we suggest that V3 serology be used instead of DNA sequencing where resources are limited. Samples giving indeterminate results by V3 peptide serology should be analyzed by direct DNA sequencing to distinguish between B-GPGR and the Brazilian variant B"-GWGR.


Subject(s)
Humans , Male , Female , Adult , /genetics , HIV Infections/virology , HIV-1 , Leukocytes, Mononuclear/virology , Peptide Fragments/genetics , Amino Acid Sequence , DNA, Viral/analysis , HIV-1 , Immunoenzyme Techniques , Polymorphism, Restriction Fragment Length , Proviruses/genetics , Sensitivity and Specificity , Serotyping
2.
Interferón biotecnol ; 5(1): 47-52, ene.-abr. 1988. ilus
Article in Spanish | LILACS | ID: lil-93479

ABSTRACT

Por su conocido efecto antiviral, se ha utilizado el interferón leucocitario humano en el tratamiento del herpes zoster. Se seleccionaron dos grupos: A y B. Grupo A: Formado por 10 pacientes que padecían de herpes zoster, en los cuales se utilizó el interferón como medicamento único. Grupo B: Compuesto por 10 pacientes con la misma enfermedad, que sirvieron como grupo control. Todos los enfermos fueron tratados durante 15 días. En el grupo A, la dosis total de interferón empleada por vía sistémica fue de 40 millones de UI en cada enfermo; la crema utilizada contiene aproximadamente 20 000 UI/g, en un vehículo hidrófilo. El grupo B recibió tratamiento de vitaminoterapia y crema de Viru-Merz. Se han obtenido resultados significativos consistentes en: - Desaparición del dolor en los 10 enfermos tratados con interferón. - Desaparición de las lesiones a los cuatro días de comenzar el tratamiento. - Involución de las lesiones a los tres días. Se concluye que el uso del interferón constituye una modalidad terapéutica eficaz en una patología tan dolorosa como el herpes zoster


Subject(s)
Humans , Male , Female , Herpes Zoster/therapy , Interferon Type I/therapeutic use
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