Utilidad de sangre almacenada en papel de filtro para estudios serologicos por ELISA de inhibicion

Para evaluar la utilidad del método de recolección de muestras de sangre en papel de filtro para la detección de anticuerpos anti-dengue mediante un ELISA de Inhibición recientemente desarrollado en nuestro laboratorio, se realizó una toma simultánea de muestras de sangre en papel de filtro y de suero, de donantes de Banco de Sangre. Ambas muestras fueron conservadas a -20ºC y probadas a los 15 dias, 3 y 6 meses respectivamente. A las muestras que resultaron positivos se les amplió el rango de dilución para determinar título. Al realizar la comparación entre ambas muestras, sangre en papel de filtro y suero, encontramos que no existían diferencias de detección significativas, tanto para los casos positivos como los negativos. No obstante se observó en ambas muestras y de forma general una disminución del titulo de anticuerpos (una dilución) al transcurrir el tiempo máximo establecido en nuestro estudio (6 meses).

[Usefulness of blood specimens on paper strips for serologic studies with inhibition ELISA]

To evaluate the usefullness of the collecting method of blood samples in filter paper strips for anti-dengue antibody detection using an ELISA Inhibition test which has been recently developed in our laboratory, blood samples collected on filter paper strips and serum samples were obtained from the same blood donors. Both samples were kept at -20 degrees C and tested at 15 days, 3 and 6 months. Titers were determined in positive samples. Comparing the results, no significant differences were found between serum samples and blood samples collected in filter paper strips in relation to the number of negative and positive cases. Nevertheless, it was observed in both types of samples a decrease of the antibody titers (one dilution) in the longest period of our study (6 months).

[ELISA for detecting antibodies against herpes simplex virus]

The results are presented of the normalization of an indirect ELISA test for detecting herpes simplex antivirus antibodies, and the conditions and criteria for positive tests are established. It was applied to 89 serum samples from patients with immunodepression and to 76 samples from blood bank donors. The results of the survey were compared by the indirect immunofluorescence technique.

Serological diagnosis of dengue by an ELISA inhibition method (EIM)

An ELISA Inhibition Method (EIM) was proposed for the serologic diagnosis of dengue, comparing its results with the Hemagglutination Inhibition (HI) and the IgM capture-ELISA (MAC-ELISA). Advantages and disadvantages of both methods are discussed according to sensitivity, specificity, performance and usefulness. As a conclusion we recommend the complementary inclusion of the EIM and MAC-ELISA substituting the HI for laboratories engaged in the diagnosis and surveillance of dengue.

[Clinical and epidemiologic aspects of acute diarrhea caused by rotavirus in children. Cuba, 1982-1984]

A total of 256 infants younger than three years, hospitalized by acute diarrhea, was studied from December 1983 to May 1984. Presence of rotavirus in their feces was demonstrated in 27.7%; in 4.3% of them, rotaviruses were associated with other agents. Vomiting followed by respiratory symptoms and fever were the main clinical symptoms observed in such patients, and in most of them diarrhea was profuse and liquid. Influence on infection by rotavirus of maternal feeding, hygienic-sanitary conditions, presence of domestic animals, and so forth, could not be demonstrated.