No wonder handwashing is considered a common courtesy. Even without soap, it can reduce the amount of bacteria on hands by 47 percent. With just plain old soap, it reduces the amount of bacteria by at least 82 percent.
Moreover, communities introduced to handwashing have seen a decrease in gastrointestinal illness (by 31 percent) and respiratory illness (by 21 percent). Clearly, washing our hands is important for our appearance and health. But it also has a wider impact: It is an essential part of safety in a food-handling situation, where even the slightest contamination from unwashed hands can lead to food poisoning.
At least, that’s the conclusion of the CDC, which analyzed cases of norovirus, a virus that causes vomiting and diarrhea, between 2009 and 2012. It found the vast majority–64 percent–of norovirus infections stem from restaurant contamination. Out of the 1,008 cases analyzed, 364 specifically cited food worker contamination as the cause, and 54 percent of those cases involved bare hand contact to ready-to-eat food.
Evan Henke, a professional service account representative for 3M Food Safety, says that although it is debated whether norovirus can survive in an animal host, it can certainly survive in a human host.
“The best way to avoid spreading norovirus through food is plain old, do not prepare food product when you’re sick with norovirus. So the problem that the food industry faces, then, is that people are very motivated to go to work, even when they’re sick. They may be … ill with vomiting and diarrhea, but they need to come to work in order to earn a paycheck,” he says.
The virus is also an issue in food service areas other than restaurants such as nursing homes, school cafeterias, and hotels, Henke says. Seventeen percent of foodborne norovirus cases come from “Catering or Banquet Facilities,” according to the CDC report. Though cruise ships compose only about 1 percent of cases, they attract plenty of bad press for an outbreak.
Michele Colbert, vice president of sales and marketing at Meritech Corp., warns that alcohol-based hand antiseptics do not work against the virus. The only effective strategy for killing the virus is using strong chemicals, like bleach, that would damage hands. Yet washing soap and warm water can remove the virus sufficiently well to prevent contamination.
So what’s a food worker to do? The CDC has issued specific guidelines for the best method of handwashing, in the following steps:
1. Wash hands with clean, running water, turn water off, and apply soap. Although many people believe that hot water is essential for a complete wash, the CDC does not require a specific temperature, and several studies have shown no difference in cleanliness with hot water.
2. Lather hands, including backs of hands, between fingers, and underneath the fingernails. Studies have revealed that the fingernails can harbor dirt and germs. Remember, as little as 18 norovirus specimens can lead to infection.
3. Scrub hands for 15 to 20 seconds, about the time to sing “Happy Birthday” twice.
4. Rinse hands thoroughly.
5. Dry hands.
Along with CDC guidelines, the FDA’s 2013 Food Code, issued as a guide to state and local health departments, outlines a handwashing strategy. It recommends use of a fingernail brush and highlights the benefits of vigorous scrubbing: “All aspects of proper handwashing are important in reducing microbial transients on the hands. However, friction and water have been found to play the most important role…The abrasive action obtained by vigorously rubbing the surfaces being cleaned…loosens the transient microorganisms on the hands.” Handwashing should take place at a well equipped, easily accessible station that is never used for food preparation or service (i.e., cleaning mops and rags).