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Development of a quantitative rapid diagnostic test for multibacillary leprosy using smart phone technology
Ludimila Paula Vaz Cardoso, Ronaldo Ferreira Dias, Aline Araújo Freitas
1Tropical Pathology and Public Health Institute, Federal University of Goiás, 235th Street, Setor Universitário, 74605-050 Goiânia-Goiás, Brazil. mariane.stefani@pq.cnpq.br.
BMC Infectious Diseases
|October 25, 2013
Summary
A new rapid diagnostic test for multibacillary leprosy offers improved detection rates compared to traditional methods. This simple, objective test aids early diagnosis, treatment, and control of leprosy transmission.
Area of Science:
- Immunology
- Infectious Diseases
- Medical Diagnostics
Background:
- Leprosy diagnosis relies on clinical signs, but expertise is declining.
- Delayed diagnosis leads to disabilities and continued transmission.
- A need exists for simple, objective diagnostic tools for multibacillary leprosy.
Purpose of the Study:
- To develop and evaluate a rapid immunochromatographic test for diagnosing multibacillary leprosy.
- To assess the performance of the test in conjunction with a smartphone-based reader.
Main Methods:
- Developed a rapid test using two key leprosy antigens (ND-O and LID-1) on a nitrocellulose membrane.
- Detected specific IgM and IgG antibodies in patient sera within 20 minutes.
- Integrated the NDO-LID® rapid test with a smartphone-based Smart Reader® for objective interpretation.
Main Results:
- The NDO-LID® test with Smart Reader® detected a higher proportion of leprosy patients than PGL-I ELISA.
- Sensitivity for multibacillary leprosy was 87% and specificity was 96.1%.
- Positive and negative predictive values were 94% and 91.4%, respectively.
Conclusions:
- Rapid diagnostic tests can significantly aid in the early detection and prognosis of multibacillary leprosy.
- Implementation of these tests can improve leprosy control programs.
- Objective, rapid diagnosis can lead to appropriate treatment and interrupt transmission.
