Assessing the Removal Efficiency of Murine Norovirus 1, Hepatitis A Virus, and Human Coronavirus 229E on Dish Surfaces Through General Wash Program of Household Dishwasher.

ABSTRACT

The performance of dishwashers in removing live viruses is an important informative value in practical applications. Since foodborne viruses are present in contaminated food surfaces and water environments. Insufficient washing of dishes typically makes a carrier of foodborne viruses. Dishwashers have shown excellent performance in removing bacterial pathogens, but very limited reports related to eliminate foodborne viruses on contaminated dish surfaces. Here, murine norovirus 1 (MNV-1), hepatitis A virus (HAV), and human coronavirus 229E (HCoV-229E) were experimentally inoculated on the dish surfaces (plate, rice bowl, and soup bowl). Plaque assay, 50% tissue culture infectious dose (TCID50), and real-time quantitative polymerase chain reaction (RT-qPCR) were conducted to determine their removal efficiency of them through the general wash program of household dishwashers. Using titration assay, MNV-1 and HAV were reduced by 7.44 and 6.57 log10 PFU/dish, and HCoV-229E was reduced by 6.43 log10 TCID50/dish through the general wash program, achieving a ≥ 99.999% reduction, respectively. Additionally, RT-qPCR results revealed that viral RNA of MNV-1 and HCoV-229E reduced 5.02 and 4.54 log10 genome copies/dish; in contrast, HAV was not detected on any dish surfaces. This study confirmed the performance of household dishwashers in removing pathogenic live viruses through the general wash program. However, residual viral RNA was not sufficiently removed. Further studies are needed to determine whether the viral RNA can be sufficiently removed using combination programs in household dishwashers.