The effect of enzymatic and viability dye treatment in combination with long-range PCR on assessing Tulane virus infectivity.
J Virol Methods
; 327: 114919, 2024 Jun.
Article
em En
| MEDLINE
| ID: mdl-38531509
ABSTRACT
Human norovirus (HuNoV) is regularly involved in food-borne infections. To detect infectious HuNoV in food, RT-qPCR remains state of the art but also amplifies non-infectious virus. The present study combines pre-treatments, RNase and propidium monoazide, with three molecular analyses, including long-range PCR, to predominantly detect infectious Tulane virus (TuV), a culturable HuNoV surrogate. TuV was exposed to inactivating conditions to assess which molecular method most closely approximates the reduction in infectious virus determined by cell culture (TCID50). After thermal treatments (56 °C/5â¯min, 70 °C/5â¯min, 72 °C/20â¯min), TCID50 reductions of 0.3, 4.4 and 5.9â¯log10 were observed. UV exposure (40/100/1000â¯mJ/cm2) resulted in 1.1, 2.5 and 5.9â¯log10 reductions. Chlorine (45/100â¯mg/L for 1â¯h) reduced infectious TuV by 2.0 and 3.0â¯log10. After thermal inactivation standard RT-qPCR, especially with pre-treatments, showed the smallest deviation from TCID50. On average, RT-qPCR with pre-treatments deviated by 1.1-1.3â¯log10 from TCID50. For UV light, long-range PCR was closest to TCID50 results. Long-range reductions deviated from TCID50 by ≤0.1â¯log10 for mild and medium UV-conditions. However, long-range analyses often resulted in qPCR non-detects. At higher UV doses, RT-qPCR with pre-treatments differed by ≤1.0â¯log10 from TCID50. After chlorination the molecular methods repeatedly deviated from TCID50 by >1.0â¯log10, Overall, each method needs to be further optimized for the individual types of inactivation treatment.
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Base de dados:
MEDLINE
Assunto principal:
Propídio
/
Azidas
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Raios Ultravioleta
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Inativação de Vírus
Limite:
Humans
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article