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A multiplex reverse transcription polymerase chain reaction method for the detection of foodborne viruses
1Department of Food Science, North Carolina State University, Raleigh 27695-7624, USA.
Abstract:
A multiplex reverse transcription polymerase chain reaction (RT-PCR) method was developed for the simultaneous detection of the human enteroviruses, hepatitis A virus (HAV) and Norwalk virus (NV). Poliovirus type 1 (PV1) was chosen as a model for the human enterovirus group. Three different sets of primers were used to produce three size-specific amplicons of 435 bp, 270 bp, and 192 bp for PV1, NV, and HAV, respectively. RT-PCR products were separated by agarose gel electrophoresis, and amplicon identity was confirmed by Southern transfer followed by DNA hybridization using nonradioactive, digoxigenin-labeled internal probes. When tested on mixed, purified virus suspensions, the multiplex method achieved detection limits of < or = 1 infectious unit (PV1 and HAV) or RT-PCR-amplifiable unit (NV) for all viruses. With further streamlining efforts such as single tube amplification and liquid hybridization, multiplex PCR offers advantages over cell culture methodology and monoplex PCR because it allows for rapid and cost-effective detection of several human enteric viruses in a single reaction tube.
Insights
A new multiplex reverse transcription polymerase chain reaction (RT-PCR) method enables simultaneous detection of human enteroviruses, hepatitis A virus (HAV), and Norwalk virus (NV). This rapid, cost-effective technique enhances enteric virus diagnostics.
Area of Science:
- Virology
- Molecular Biology
- Infectious Diseases
Background:
- Enteric viruses pose significant public health challenges.
- Accurate and rapid detection methods are crucial for disease control.
- Current diagnostic methods can be time-consuming and labor-intensive.
Purpose of the Study:
- To develop a multiplex reverse transcription polymerase chain reaction (RT-PCR) assay.
- To enable simultaneous detection of human enteroviruses, hepatitis A virus (HAV), and Norwalk virus (NV).
- To establish a rapid and cost-effective diagnostic tool for enteric viruses.
Main Methods:
- A multiplex RT-PCR assay was designed using specific primers for poliovirus type 1 (PV1) as a model enterovirus, HAV, and NV.
- Amplicons of distinct sizes (435 bp, 270 bp, 192 bp) were generated for each target.
- Southern transfer and digoxigenin-labeled probes were used for confirmation of amplicon identity.
Main Results:
- The multiplex RT-PCR method achieved high sensitivity, with detection limits of ≤1 infectious unit (PV1, HAV) or RT-PCR-amplifiable unit (NV).
- The assay successfully detected all target viruses simultaneously in mixed suspensions.
- The method demonstrated potential for streamlining through single-tube amplification and liquid hybridization.
Conclusions:
- Multiplex RT-PCR offers a rapid, cost-effective alternative to traditional cell culture and monoplex PCR methods.
- This assay allows for the simultaneous detection of multiple enteric viruses in a single reaction.
- The developed method significantly advances the diagnostics of common human enteric viral infections.
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