Chagas' disease diagnosis: a multicentric evaluation of Chagas Stat-Pak, a rapid immunochromatographic assay with recombinant proteins of Trypanosoma cruzi.
A rapid serologic test for diagnosis of T. cruzi infection (Chagas Stat Pak) was developed using recombinant proteins in an immunochromatographic assay. This cassette format test was evaluated first in blind with a panel of 393 coded serum samples. The Chagas Stat-Pak identified 197 infected (98.5% sensitivity) and 183 non-infected individuals (94.8% specificity). A second evaluation was performed with 352 sera from four Latin America countries tested independently in each country, showing a sensitivity of 100% and specificity of 98.6%. A third set of tests comparing sera with plasma and eluates from filter paper as well as serum preserved in 50% glycerol did show identical results as those obtained with serum. This rapid test (15 min) uses one device per sample, does not require refrigeration nor a laboratory structure or specialized skills to be performed, accepts different types of samples and may be stored for long periods of time for result checking and documentation. These attributes together with the high sensitivity and specificity demonstrated herein, make this test a suitable tool for field studies, small laboratories and emergencies at blood banks in the countryside of endemic areas.
Luquetti
Alejandro O
AO
Instituto de Patologia e Saúde Pública, Faculdade de Medicina, Universidade Federal de Goiás, Goiania, Brazil.
Ponce
Carlos
C
Ponce
Elisa
E
Esfandiari
Javan
J
Schijman
Alejandro
A
Revollo
Susana
S
Añez
Nestor
N
Zingales
Bianca
B
Ramgel-Aldao
Rafael
R
Gonzalez
Antonio
A
Levin
Mariano J
MJ
Umezawa
Eufrosina S
ES
Franco da Silveira
José
J
D000818:Animals; D000913:Antibodies, Protozoan / Q000032:analysis*; D001118:Argentina / Q000453:epidemiology; D001938:Brazil / Q000453:epidemiology; D014355:Chagas Disease / Q000175:diagnosis* / Q000453:epidemiology; D019353:Endemic Diseases; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D011933:Reagent Kits, Diagnostic; D011994:Recombinant Proteins; D012680:Sensitivity and Specificity; D012698:Serologic Tests; D013030:Spain / Q000453:epidemiology; D013048:Specimen Handling; D014349:Trypanosoma cruzi / Q000276:immunology* / Q000302:isolation & purification; D014687:Venezuela / Q000453:epidemiology
D000913:Antibodies, Protozoan; D011933:Reagent Kits, Diagnostic; D011994:Recombinant Proteins