rK39 Antigen for the Diagnosis of Visceral Leishmaniasis by Using Human Saliva

Manisha Vaish Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India

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Om Prakash Singh Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India

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Jaya Chakravarty Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India

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Shyam Sundar Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India

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The rK39 rapid immunochromatographic test (ICT) is now being widely used in the diagnosis of visceral leishmaniasis (VL) using serum. We evaluated the presence of anti-rK-39 antibody in human saliva being noninvasive to replace the invasive procedures of diagnosis. Enzyme-linked immunosorbent assay (ELISA) and ICT assays were performed in 300 subjects: 114-confirmed VL patients, 95 and 47 healthy controls from endemic and nonendemic regions, respectively, and 44 subjects with different diseases. Sensitivity in saliva was 83.3% by ELISA and 82.5% by ICT, compared with 100% for both ICT and ELISA in serum. Specificity in saliva was 100%, 90.5%, and 88.6% with ELISA, and 91.48%, 91.57%, and 84.06% using ICT, in nonendemic, endemic, and different diseases, respectively. In serum, specificity was 97%, 88.5%, and 89% by ELISA and 100%, 94.7%, and 95.5% by ICT in nonendemic, endemic, and different diseases, respectively. Saliva is not suitable for diagnosis of VL because of low sensitivity.

Author Notes

*Address correspondence to Shyam Sundar, Professor of Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi - 221005, India. E-mail: drshyamsundar@hotmail.com

Financial support: This study was partially funded by the Tropical Medicine Research Center grant number: P50AI074321 from National Institute of Allergy and Infectious disease (NIAID), DMID funding mechanism.

Authors' addresses: Manisha Vaish, Om Prakash Singh, Jaya Chakravarty, and Shyam Sundar, Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India, E-mails: vaish.manisha@gmail.com, opsingh@imsbhu.com, tapadar@gmail.com, and drshyamsundar@hotmail.com.

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