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1.
Rev. cuba. invest. bioméd ; 21(2): 69-75, abr.-jun. 2002. tab
Article in Spanish | LILACS | ID: lil-322821

ABSTRACT

Se procedió a estandarizar un método inmunoenzimático, heterogéneo, cualitativo, tipo sandwich de doble antígeno para la detección de anticuerpos contra la estreptoquinasa en muestras puras de suero humano. Se ensayaron diferentes concentraciones del antígeno de recubrimiento y diluciones del conjugado, así como diferentes tiempos y temperaturas de incubación de las muestras. Se estableció el valor de corte del ensayo y su límite de detección y se comprobó si existían inespecificidades. Se determinó como concentración óptima de recubrimiento 0,1 µg/mL para una dilución del conjugado de 1:100 000. Las condiciones óptimas de incubación de las muestras fueron 30 min a temperatura de laboratorio y no se comprobaron interferencias de otros analitos con la técnica. Se establecieron como valores normales de la técnica las densidades ópticas que se encuentran entre 0,282 y 0,654


Subject(s)
Enzyme-Linked Immunosorbent Assay , Streptococcal Infections/diagnosis , Streptococcus , Streptokinase
2.
Rev. cuba. invest. bioméd ; 19(1): 14-27, ene.-abr. 2000.
Article in Spanish | LILACS | ID: lil-628720

ABSTRACT

La infección crónica por el virus de la hepatitis B (VHB) es una clara e importante causa de morbilidad y mortalidad en el mundo. Un importante problema para el control y la erradicación de la enfermedad es la exisniveles de anti-AgsHB, después del esquema completo de vacunación en consanguíneos y no consanguíneos, resultó ser de tipo negativa en los primeros e infirió la existencia de genes compartidos relacionados con el control de la respuesta anti-AgsHB y con el aclaramiento viral.


Chronic infection by HBV is a clear and important cause of morbidity and mortality worldwide. An important problem, for the control and eradication of this disease is the existance of chronic HBV carriers and their family contacts. A biochemical and immunological study of chronic HBV reservoirs were conducted to determine the relation between the concentrations of HBV surface antigen, detected and quantified by the ELISA method, and the serum viral DNA concentrations; as well as the correlation between the levels of antigenemia and the transaminase values (ALAT). A direct linking was proved between viral DNA and HbsAg levels and also between antigen concentration and ALAT values. A significant percent of carriers with high viral charges and normal enzymatic levels was observed. The performance of immune response to HBV in those persons living with the chronic HBV-infested subjects was analyzed and the frequency of occurence of immune, sensitive and infected persons was estimated resulting in a high number of infected persons and persons living with the chronic patients without protection. Qualitative and quantitative ELISA were used to assess the response of antibodies to HbsAg, induced by vaccines or by normal contacts of blood related and non-related persons in the family, but there was no difference among them. The HbsAg concentration of the carrier was associated with levels of antibodies to HbsAg; after completion of the vaccination program in blood related and non-related subjects, then the association was found to be negative in the former and the existance of shared gens linked to the control of anti-HbsAg response and viral clearing were infered.

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