Volume 82, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



An automated colorimetric micro-neutralization assay (CmNt) was developed for confirmation and differentiation of West Nile Virus (WNV)-positive human sera as a higher throughput alternative to the standard six-well plaque-reduction neutralization test (PRNT). CmNt was performed in high-capacity 96-well micro-titer plates and required 4–6 days to complete. Inhibition of infection was determined by reduced neutral red-dye retention and conveniently recorded by a colorimetric plate reader. Human sera previously confirmed by PRNT as either negative ( = 52), WNV positive ( = 81), or St. Louis encephalitis virus positive ( = 12) were tested by CmNt; interpreted results were virtually identical to PRNT with a reduced turnaround time and higher throughput. Additionally, a handful of dengue virus positive and negative specimens (four each) were tested by CmNt; interpreted results were identical to PRNT.


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  • Received : 29 May 2009
  • Accepted : 08 Dec 2009
  • Published online : 05 Mar 2010
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