Title: Multi-site evaluation of the LN34 pan-lyssavirus real-time RT-PCR assay for post-mortem rabies diagnostics

Journal Article · · PLoS ONE
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  1. Centers for Disease Control and Prevention (CDC), Atlanta, GA (United States); OSTI
  2. Pennsylvania Department of Health, Exton, PA (United States)
  3. Wisconsin State Laboratory of Hygiene, Madison, WI (United States)
  4. Centers for Disease Control and Prevention (CDC), Atlanta, GA (United States)
  5. Maryland Department of Health, Baltimore, MD (United States)
  6. New Mexico Department of Health, Santa Fe, NM (United States)
  7. Department of Health, Research Institute for Tropical Medicine, Alabang Muntinlupa City, Manila (Philippines)
  8. New York State Department of Health, Albany, NY (United States)
  9. University of Georgia, Athens, GA (United States)
  10. California Department of Public Health, Sacramento, CA (United States)
  11. Public Health Institute of Chile, Santiago (Chile)
  12. Public Health Command Europe, Landstuhl (Germany)
  13. Ministère de l’Agriculture, Port-au-Prince (Haiti)
  14. Karnataka Veterinary, Animal and Fisheries Sciences University, Bangalore (India)
  15. Animal Health Centre, Ministry of Agriculture, Abbotsford (Canada)

Rabies is a fatal zoonotic disease that requires fast, accurate diagnosis to prevent disease in an exposed individual. The current gold standard for post-mortem diagnosis of human and animal rabies is the direct fluorescent antibody (DFA) test. While the DFA test has proven sensitive and reliable, it requires high quality antibody conjugates, a skilled technician, a fluorescence microscope and diagnostic specimen of sufficient quality. The LN34 pan-lyssavirus real-time RT-PCR assay represents a strong candidate for rabies post-mortem diagnostics due to its ability to detect RNA across the diverse Lyssavirus genus, its high sensitivity, its potential for use with deteriorated tissues, and its simple, easy to implement design. Here, we present data from a multi-site evaluation of the LN34 assay in 14 laboratories. A total of 2,978 samples (1,049 DFA positive) from Africa, the Americas, Asia, Europe, and the Middle East were tested. The LN34 assay exhibited low variability in repeatability and reproducibility studies and was capable of detecting viral RNA in fresh, frozen, archived, deteriorated and formalin-fixed brain tissue. The LN34 assay displayed high diagnostic specificity (99.68%) and sensitivity (99.90%) when compared to the DFA test, and no DFA positive samples were negative by the LN34 assay. The LN34 assay produced definitive findings for 80 samples that were inconclusive or untestable by DFA; 29 were positive. Five samples were inconclusive by the LN34 assay, and only one sample was inconclusive by both tests. Furthermore, use of the LN34 assay led to the identification of one false negative and 11 false positive DFA results. Together, these results demonstrate the reliability and robustness of the LN34 assay and support a role for the LN34 assay in improving rabies diagnostics and surveillance.

Research Organization:
Oak Ridge Insitute. for Science and Education (ORISE), Oak Ridge, TN (United States)
Sponsoring Organization:
Centers for Disease Control and Prevention; USDOE Office of Science (SC)
Grant/Contract Number:
SC0014664
OSTI ID:
1904894
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 5 Vol. 13; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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