Rapid screening with a recombinant antigen (rK39) for diagnosis of visceral leishmaniasis using dipstick.
OBJECTIVE
To evaluate the diagnostic value of the recombinant antigen of 39 amino acid repeats encoded by a kinesin-like gene of Leishmania changasi (rK39) in serodiagnosis of visceral leishmaniasis (VL).


METHODS
In Kashi, Xinjiang, 13 VL patients with splenomegaly and bone marrow aspirate culture positive were subjected to dipstick assay. A drop of whole blood or serum from patient was placed at the absorbing pad at the bottom of the dipstick. Flooding of the bottom protein with buffer allows serum proteins to migrate upwards, producing the positive band and Western blot analysis of rK39 subsequently performed with the sera collected.


RESULTS
The end-point titers of anti-rK39 antibodies of these sera were determined by ELISA and found to fall within the range of 10(-2) to 10(-4), which were consistent with the intensity of their reaction with rK39 in dipstick assay. The positive sera could also recognize the specific rK39 band as analyzed by Western blot analysis.


CONCLUSIONS
The rK39 dipstick assay is more rapid, specific, sensitive and less invasive than the conventional methods of diagnosis for VL in the areas of low endemicity.
Qu
J Q
JQ
Institute of Parasit Diseases, Chinese Academy of Preventive Medicine, Shanghai 200025.
Guan
L R
LR
Shulidan
I
I
Zuo
X P
XP
Chai
J J
JJ
Chen
S B
SB
Kawazu
S
S
Katakura
K
K
Matsumoto
Y
Y
Reed
S G
SG
Chang
K P
KP
D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D000953:Antigens, Protozoan / Q000276:immunology*; D006801:Humans; D007893:Leishmania donovani / Q000276:immunology*; D007898:Leishmaniasis, Visceral / Q000175:diagnosis* / Q000276:immunology; D011934:Reagent Strips; D011994:Recombinant Proteins / Q000276:immunology
D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D011934:Reagent Strips; D011994:Recombinant Proteins