1. Malaria seroepidemiology: comparison between indirect fluorescent antibody test and enzyme immunoassay using bloodspot eluates
- Author
-
Maria Esther de Carvalho, Marcelo Urbano Ferreira, Márcia Regina Delgado de Souza, Regina Tomoko Ninomia, Guiomar Fonseca Matos, Luís Marcelo Aranha Camargo, and Cláudio Santos Ferreira
- Subjects
ELISA ,IFAT ,malaria ,serology ,bloodspot eluates ,Brazilian Amazon Region ,Microbiology ,QR1-502 ,Infectious and parasitic diseases ,RC109-216 - Abstract
Blood sampling on filter paper is a current practice seroepidemiological studies by indirect fluorescent antibody test (IFAT). There is, however, scant comparative information about the use of bloodspot eluates for detection of malarial IgG antibodies simultaneously by IFAT and enzyme immunoassay (ELISA). Here we report data obtained by both serological methods done on 219 bloodspot eluate samples collected in a rural community in Brazilian Amazon Basin (Alto Paraíso, Ariquemes municipality) where malaria is endemic. Plasmodium falciparum and P. vivax thick smear antigens were used in the IFAT; a detergent-soluble P. falciparum antigen was prepared for ELISA. Substantial agreement of results (Kappa coefficient k = 0.686) was observed when P. falciparum antigen was used in both tests, and IFAT titers were found to be strongly correlated ELISA antibody units (Spearman correlation coeficient rs = 0.818, p < 0.0001). Only moderate agreement (k = 0.467) between IFAT with P. vivax antigen and ELISA with P. falciparum antigen was observed. Spearman correlation coefficient value between quantitative results (IFAT titers and ELISA antibody units) in this case was numerically lowe (rs = 0.540, p < 0.0001). Our results suggest that, with P. falciparum antigen, both IFAT and ELISA performed on bloodspot eluates are equivalent for seropidemiological purposes.
- Published
- 1992
- Full Text
- View/download PDF