[Standardization and use of an immunoenzymatic method using infected cells as antigens in routine diagnosing of dengue].

INTRODUCTION This paper show the standardization and use of the immunoenzymatic method using infected cells as antigens (EIA-ICC) for routine serological diagnosing of dengue. METHODS In optimizing the test, a dose of 1,000 TCID50 of dengue type 3 virus (DENV-3) was used, and 100,000 C636 cells infected with 1,000 TCID50 (DENV-3) were used. RESULTS The results obtained with EIA-ICC were compared with the HUMAN commercial dengue kit. The results were highly concordant. The EIA-ICC showed moderate sensitivity and high specificity. The test was used for serologically diagnosing 1,797 blood samples from suspected dengue cases during the 2006 epidemic in Ribeirao Preto. From the serological evaluation, 228 samples were positive for IgM against DENV-3; 235 samples were positive for IgG against DENV-3; and 35 samples were positive for both IgG and IgM. CONCLUSIONS EIA-ICC was shown to be reliable and simple, and suitable for serologically diagnosing dengue.