ABSTRACT
Introducción: El dengue se ha convertido en una de las enfermedades de mayor impacto epidemiológico, social y económico para la salud pública a nivel mundial. Objetivo: Determinar la seroprevalencia de dengue en cinco municipios del Valle del Cauca con transmisión hiperendémica y mesoendémica de la enfermedad. Métodos: Estudio de prevalencia mediante muestreo probabilístico por conglomerados multietápico. Se evaluaron 822 personas. Resultados: La seroprevalencia de dengue fue del 91,36 por ciento obtenida a partir de la aplicación de la prueba de ensayo por inmunoabsorción ligado a enzimas para dengue indirecta IgG. Al aplicar la prueba de captura para IgM para dengue, la seroprevalencia fue de un 21,41 por ciento. La seropositividad conjunta de anticuerpos IgM e IgG fue del 20,3 por ciento. Conclusiones: La alta seroprevalencia de dengue en el Valle del Cauca muestra el impacto de esta enfermedad en la historia de vida de sus residentes. Su reemergencia impacta negativamente en los que tienen como antecedentes haber padecido la enfermedad provocando un desarrollo de su variante más grave, lo que se puede evitar con la administración de una vacuna tetravalente contra el dengue(AU)
Introduction: Dengue has become one of the largest epidemiological, social, and economic impacts for global public health. Objective: To determine the seroprevalence of dengue in five municipalities of Valle del Cauca with hyperendemic and mesoendemic transmission of the disease. Methods: Prevalence study through multistage probability sampling by clusters. 822 people were assessed. Results: Seroprevalence of dengue was of 91.36 percent, it was obtained from the implementation of the enzyme-linked immunosorbent´s trial test for indirect dengue IgG. When applying the capture test IgM for dengue, seroprevalence was of 21.41 percent. The joint seropositivity of IgM and IgG antibodies was 20.3 percent. Conclusions: The high seroprevalence of dengue in Valle del Cauca shows the impact of this disease in the life history of the residents. Dengue re-emergence impacts negatively on those who have a background of having suffered from the disease which caused a development of its most severe variant that can be avoided with the administration of a quadrivalent vaccine against dengue(AU)
Subject(s)
Humans , Male , Female , Immunoglobulins , Seroepidemiologic Studies , Dengue/epidemiology , ColombiaABSTRACT
In the present work, we have examined the effect of PAF, removal of epithelium, the mechanism of desensitization, and the substances that increases the level of intracellular c-AMP on the differences of mediator release from superfused tracheal strips after passive sensitization with IgG1 versus IgE Ab. In the passive sensitized tracheal tissues, the effect of PAF and the mechanism of desensitization have been examined by PAF antagonist, CV 3988 and DFP, respectively. The epithelium was stripped from one-half of each trachea by mechanical means. Both superfused tracheal tissues were challenged with Ox-Ag. Inhibitors of mediator release were added into a superfused buffer. Hist released was determined by spectrophotofluorometer, and LT by radioimmunoassay. PAF known to mediate the allergic reaction was not released by Ag after both Ab sensitization. Epithelium removal resulted in similar contraction, Hist and LT release after IgG1 Ab activation, but in the IgE Ab activation, epithelium removal resulted in smaller contraction and Hist release. In the L-cysteine and indomethacin pretreatment after two Ab sensitization, epithelium removal decreased the release of Hist and LT. The compound 48/80 pre-challenge and epithelium removal resulted in the increase of Hist release, but in the decrease of LT release after IgG1 or IgE sensitization. The Amount of LT released by Ag after compound 48/80 pre-challenge increased in the absence or presence of epithelium after both Ab sensitization. Mediator release from tissues sensitized with both Abs was not changed by DFP. The responses of inhibitors to prevent the mediator release were more effective on the IgE Ab than on the IgG1 Ab sensitization. These studies suggest that the tracheal epithelium can act to inhibit immune- and non-immune-induced airway responses. Non-immunological responses may in part reflect the role of epithelium as a diffusion barrier and modulator of mediator release. These data also suggest that immunological responses are related to the localization and functional heterogeneity of tissue mast cells.
Subject(s)
Female , Animals , Epithelium/immunology , Guinea Pigs , Histamine Release , Immunization , Immunoglobulin E/immunology , Immunoglobulin G/immunology , Leukotrienes/metabolism , Mast Cells/immunology , Trachea/immunologyABSTRACT
Newborn premature babies have lwo levels of transplacentally acquired maternal immunoglobulin which is mostly transferred after 32~34 weeks gestaton, therefore they may have IgG deficiencies that increase their susceptibility to bacterial infection. We performed this study to determine whether intravenous immunoglobulin (IVIG) therapy improves mortality or infection occurrance rate. From 1 october 1991 to 31 July 1992, 73premature newborn infants with gestational age< or =34weeks were enrolled: the theatment group, consisting of 43infants who received prophylactic intravenous immunoglobulin therapy (500mg/kg/week) and the control group, consisting of 30infants who did not receive. prophylactic intravenous administration of immunoglobulin to preterm infants with a gestational ageage< or =34week, at a dose of 500mg/kg/week, results in maintenance of a satisfactory serum IgG level throughout the high-risk period for infection. But the incidence rates of proven or very probable sepsis, mortality for sepsis and total mortality in the infants receiving intravenous immunoglobulin were not significant differences when compared with those in the control infants. No adverse effects were noted after immunoglobulin transfusions in our subjects. In conclusion, our study does not show any decrease in bacterial infection rate or in mortality rate, and no study in the literature has shown absolute proof of the prophylactic efficacy of IVIG in premature newborns. Larger studies are necessary to confirm these observations and to determine more effective dosing schedules and the optimal levels of orhanism-spectific antibodies. And specific hyperimmnue of monoclonal antibody preparations may be required to provide reliable sources of effective prophylactic to premature neonate with high risk in bacterial sepsis.