Re-Use of Plastic Bags Increases E. Coli Infections
(p. A13) Though reducing plastic-bag use might be good for the environment, encouraging the re-use of plastic bags for food-toting may not be so healthy for humans. After San Francisco introduced its ban on non-compostable plastic bags in large grocery stores in 2007, researchers discovered a curious spike in E. coli infections, which can be fatal, and a 46% increase in deaths from food-borne illnesses, according to a study published in November 2012 by the University of Pennsylvania and George Mason University. "We show that the health costs associated with the San Francisco ban swamp any budgetary savings from reduced litter," the study's authors observed.
Affirming this yuck factor, a 2011 study from the University of Arizona and Loma Linda University found bacteria in 99% of reusable polypropylene bags tested; 8% of them were carrying E. coli. The study, though it mainly focused on plastic bags, also looked at two cotton reusable bags--and both contained bacteria.
Bag-ban boosters counter that consumers just need to wash their bags and use separate bags for fish and meat. If only my washing machine had a "reusable bag vinegar rinse cycle." A paltry 3% of shoppers surveyed in that same 2011 study said they washed their reusable bags. Has anybody calculated the environmental impact of drought-ravaged Californians laundering grocery bags?
For the full commentary, see:
(Note: the online version of the commentary has the date March 7, 2014.)
The 2012 study mistakenly labelled above as "published" is:
Klick, Jonathan and Wright, Joshua D., Grocery Bag Bans and Foodborne Illness (November 2, 2012). U of Penn, Inst for Law & Econ Research Paper No. 13-2. Available at SSRN: http://ssrn.com/abstract=2196481 or http://dx.doi.org/10.2139/ssrn.2196481
The 2011 article mentioned above, is:
Williams, David L., Charles P. Gerba, Sherri Maxwell, and Ryan G. Sinclair. "Assessment of the Potential for Cross-Contamination of Food Products by Reusable Shopping Bags." Food Protection Trends 31, no. 8 (Aug. 2011): 508-13.