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A Rapid Single-Tube Protocol for HAV Detection by Nested Real-Time PCR

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Abstract

Infections by food-borne viruses such as hepatitis A virus (HAV) and norovirus are significant public health concerns worldwide. Since food-borne viruses are rarely confirmed through direct isolation from contaminated samples, highly sensitive molecular techniques remain the methods of choice for the detection of viral genetic material. Our group has previously developed a specific nested real-time PCR (NRT-PCR) assay for HAV detection that improved overall sensitivity. Furthermore in this study, we have developed a single-tube NRT-PCR approach for HAV detection in food samples that reduces the likelihood of cross contamination between tubes during sample manipulation. HAV RNA was isolated from HAV-spiked food samples and HAV-infected cell cultures. All reactions following HAV RNA isolation, including conventional reverse transcriptase PCR, nested-PCR, and RT-PCR were performed in a single tube. Our results demonstrated that all the samples tested positive by RT-PCR and nested-PCR were also positive by a single-tube NRT-PCR. The detection limits observed for HAV-infected cell cultures and HAV-spiked green onions were 0.1 and 1 PFU, respectively. This novel method retained the specificity and robustness of the original NRT-PCR method, while greatly reducing sample manipulation, turnaround time, and the risk of carry-over contamination. Single-tube NRT-PCR thus represents a promising new tool that can potentially facilitate the detection of HAV in foods thereby improving food safety and public health.

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Abbreviations

HAV:

Hepatitis A virus

NRT-PCR:

Nested real-time PCR

PFU:

Plaque-forming unit

TCID:

Tissue culture infective dose

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Acknowledgment

The authors would like to thank Dr. Paul Morin (FDA Northeast Regional Laboratory) for critically reading the manuscript.

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Correspondence to Yuan Hu.

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Hu, Y., Arsov, I. A Rapid Single-Tube Protocol for HAV Detection by Nested Real-Time PCR. Food Environ Virol 6, 189–195 (2014). https://doi.org/10.1007/s12560-014-9152-6

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  • DOI: https://doi.org/10.1007/s12560-014-9152-6

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