Thaw tests turn up dicey bagged ice

ice freezer

IN THE BAG  If safe handling procedures aren’t followed, bacteria and other contaminants can end up in bagged ice.

Mike Mozart/flickr (CC BY 2.0)

Ice isn’t always nice.

Tests of 156 bags of ice sold in grocery stores, liquor stores and gas stations across Southern California found that 19 percent exceeded recommended thresholds for bacterial contamination. Researchers also found that 56 percent had detectable levels of mold or yeast. The research was presented in Boston June 17 at ASM Microbe 2016.

About 2 billion bags of ice are sold every year, according to the International Packaged Ice Association, which sponsored the research. IPIA sets ice handling standards, including requiring that ice contain fewer than 500 microbial colonies per milliliter of thawed ice.

All bagged ice that meets IPIA standards carries this label. IPIA

The greatest contamination occurred in a sample that contained 24,000 colonies per milliliter, according to Justin Lee, a master’s degree student at Cal Poly Pomona in California who presented the independent research. None of the ice adhering to IPIA requirements exceeded acceptable levels of microbes. About 500 of roughly 700 North American companies that sell ice follow IPIA practices and pay a membership fee for testing and auditing to put the IPIA seal on their products.

About Laura Beil

Laura Beil is a contributing correspondent. Based outside Dallas, Beil specializes in reporting on medicine, health policy and science.

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