Immunoassay device and immunoassay method using the same

1. An immunoassay device for detecting an anti-syphilis treponeme antibody in a specimen which comprises a matrix which can transfer a solution by capillarity, wherein the following are disposed on the matrix:

(1) a specimen dotting zone,

(2) a labeling reagent zone comprising a labeled genetic recombinant syphilis treponeme antigen, wherein the labeling reagent zone is downstream of the specimen dotting zone or the specimen dotting zone is provided on the labeling reagent zone, and the genetic recombinant syphilis treponeme antigen is at least one selected from the group consisting of a TP 15 antigen having a molecular weight of 15 kpa, a TP17 antigen having a molecular weight of 17 kDa, a TP42 antigen having a molecular weight of 42 kDa and a TP47 antigen having a molecular weight of 47 kDa and a fusion antigen of syphilis treponema in which two or more above syphilis treponeme antigens are fused,

(3) at least two detection zones each comprising an immobilized genetic recombinant syphilis treponeme antigen which binds a complex formed between the anti-syphilis treponeme antibody and the labeled genetic recombinant syphilis treponeme antigen, wherein

the detection zones are downstream of the labeling reagent zone and

in one of the at least two detection zones, the genetic recombinant syphilis treponeme antigen is a TP47 antigen having a molecular weight of 47 kDa, and

in the other of the at least two detection zones, the genetic recombinant syphilis treponeme antigen is at least one selected from the group consisting of a TP 15 antigen having a molecular weight of 15 kDa, a TP17 antigen having a molecular weight of 17 kDa, a TP42 antigen having a molecular weight of 42 kDa and a fusion antigen of syphilis treponema in which two or more above syphilis treponeme antigens are fused.

2. The device according to claim 1 , wherein the specimen dotting zone is provided on the labeling reagent zone.

3. The device according to claim 1 , wherein the labeling reagent zone is a water-absorbable pad containing the labeled genetic recombinant syphilis treponeme antigen on the matrix, and the specimen dotting zone is disposed on the labeling reagent zone, and said label is an enzyme.

4. The device according to claim 1 , wherein the labeled genetic recombinant syphilis treponeme antigen is labeled with a label selected from the group comprising, a radioisotope, a latex, metal colloid particles, fluorescent particles or colored particles.

5. The device according to claim 1 , wherein the labeling reagent zone is a water-absorbable pad containing the labeled genetic recombinant syphilis treponeme antigen to which a specimen is added, on the matrix, and the specimen dotting zone is disposed on the labeling reagent zone, and said label is selected from the group comprising a radioisotope, a latex, metal colloid particles, fluorescent particles or colored particles.

6. The device according to claim 1 , wherein the device has a specimen developing solution zone for adding a developing solution containing a specimen and a genetic recombinant syphilis treponeme antigen labeled with a label selected from the group comprising a radioisotope, a latex, metal colloid particles, fluorescent particles or colored particles, and a developing solution-absorbing zone, all of which are disposed on the matrix.

7. The device according to claim 1 , wherein the device has a developing solution zone upstream of the labeling reagent zone and a developing solution absorbing zone downstream of the detection zones.

8. The device according to claim 7 , wherein the developing solution zone contains a substrate, and the labeled genetic recombinant syphilis treponeme antigen is labeled with an enzyme.

9. The device according to claim 7 , wherein the device has a substrate zone on the matrix, and the labeled genetic recombinant syphilis treponeme antigen is labeled with an enzyme.

10. The device according to claim 7 , wherein the specimen dotting zone is disposed on the labeling reagent zone.

11. The device according to claim 8 , wherein the specimen dotting zone is disposed on the labeling reagent zone.

12. The device according to claim 9 , wherein the specimen dotting zone is disposed on the labeling reagent zone.

13. The device according to claim 7 , wherein the labeling reagent zone is a water-absorbable pad containing the labeled genetic recombinant syphilis treponeme antigen labeled on the matrix, and the specimen dotting zone is disposed on the labeling reagent zone, and said label is an enzyme.

14. The device according to claim 8 , wherein the labeling reagent zone is a water-absorbable pad containing the labeled genetic recombinant syphilis treponeme antigen on the matrix, and the specimen dotting zone is disposed on the labeling reagent zone, and said label is an enzyme.

15. The device according to claim 9 , wherein the labeling reagent zone is a water-absorbable pad containing the labeled genetic recombinant syphilis treponeme antigen on the matrix, and the specimen dotting zone is disposed on the labeling reagent zone, and said label is an enzyme.

16. The device according to claim 7 , wherein the labeled genetic recombinant syphilis treponeme antigen is labeled with a label selected from the group comprising a radioisotope, a latex, metal colloid particles, fluorescent particles or colored particles.

17. The device according to claim 16 , wherein the labeling reagent zone is a water-absorbable pad containing the labeled genetic recombinant syphilis treponeme antigen, to which a specimen is added, on the matrix, and the specimen dotting zone is disposed on the labeling reagent zone, and said label is selected from the group comprising a radioisotope, a latex, metal colloid particles, fluorescent particles or colored particles.