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Dishwashing Won't Kill Tummy-Troubling Norovirus: Study
Date:12/12/2012

WEDNESDAY, Dec. 12 (HealthDay News) -- Commercial dishwashers can kill everyday bacteria but not norovirus, the cause of stomach flu and many foodborne illnesses around the world, according to a new study.

Although restaurant-industry guidelines for cleaning dishes and silverware eliminate bacteria, they are not effective against norovirus, said researchers from Ohio State University. They found the virus can withstand both manual and mechanical washing.

"We know that when public food establishments follow the cleaning protocols, they do a very good job at getting rid of bacteria," study leader Melvin Pascall, associate professor in the department of food science and technology, said in a university news release. "Now we can see that the protocols are less effective at removing and killing viruses, and this may help explain why there are still so many illnesses caused by cross-contaminated food."

For the study, published recently in the journal PLoS One, researchers contaminated cream cheese and reduced-fat milk with a norovirus, E. coli or Listeria, three common causes of foodborne illness. These dairy products were then applied to stainless-steel utensils, ceramic plates and drinking glasses. The utensils were washed by hand or in a dishwasher following sanitizing protocols that used chlorine and quaternary ammonium compound (germicidal detergent).

Both hand-washing and dishwashers reduced E. coli and Listeria to safe levels. Although dishwashers were more effective at eliminating potentially harmful bacteria and viruses, the researchers found neither cleaning method could reduce the presence of norovirus.

"Even though the protocols were able to kill some of the virus, norovirus is highly contagious and it takes only a few viral particles to infect humans," noted Jianrong Li, assistant professor of food virology. "These results would indicate that neither the detergents
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