Greening Our Way to Infection

The Covid-19 outbreak is giving new meaning to those “sustainable” shopping bags that politicians and environmentalists have been so eager to impose on the public. These reusable tote bags can sustain the Covid-19 and flu viruses—and spread the viruses throughout the store...The Covid-19 virus is just one of many pathogens that shoppers can spread unless they wash the bags regularly, which few people bother to do. Viruses and bacteria can survive in the tote bags up to nine days, according to one study of coronaviruses. The risk of spreading viruses was clearly demonstrated in a 2018 study published in the Journal of Environmental Health. The researchers, led by Ryan Sinclair of the Loma Linda University School of Public Health, sent shoppers into three California grocery stores carrying polypropylene plastic tote bags that had been sprayed with a harmless surrogate of a virus. After the shoppers bought groceries and checked out, the researchers found sufficiently high traces of the surrogate to risk transmission on the hands of the shoppers and checkout clerks, as well as on many surfaces touched by the shoppers, including packaged food, unpackaged produce, shopping carts, checkout counters, and the touch screens used to pay for groceries. The researchers said that the results warranted the adaptation of “in-store hand hygiene” and “surface disinfection” by merchants, and they also recommended educating shoppers to wash their bags. An earlier study of supermarkets in Arizona and California found large numbers of bacteria in almost all the reusable bags—and no contamination in any of the new single-use plastic bags. When a bag with meat juice on the interior was stored in the trunk of a car, within two hours the number of bacteria multiplied tenfold. The researchers also found that the vast majority of shoppers never followed the advice to wash their bags. One of the researchers, Charles Gerba of the University of Arizona, said that the findings “suggest a serious threat to public health,” particularly from fecal coliform bacteria, which was found in half the bags. These bacteria and other pathogens can be transferred from raw meat in the bag and also from other sources. An outbreak of viral gastroenteritis among a girls’ soccer team in Oregon was traced to a resuable grocery bag that had sat on the floor of a hotel bathroom. In a 2012 study, researchers analyzed the effects of San Francisco’s ban on single-use plastic grocery bags by comparing emergency-room admissions in the city against those of nearby counties without the bag ban. The researchers, Jonathan Klick of the University of Pennsylvania and Joshua Wright of George Mason University, reported a 25 percent increase in bacteria-related illnesses and deaths in San Francisco relative to the other counties. The city’s Department of Public Health disputed the findings and methodology but acknowledged that “the idea that widespread use of reusable bags may cause gastrointenstinal infections if they are not regularly cleaned is plausible.”...MORE