Tag Archives: Indicator

More pre-washed salad silliness

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I hate when I come up with a smart answer long after the opportunity has passed.

A barfblog reader nudged me yesterday regarding the Consumer Reports oh-my-god-there’s-bacteria-in-salad story to say,

“We had a good laugh at the CR story. Note how they merely pointed out that there were bacteria on the ‘RTE’ products they tested. They didn’t bother to find out that—uh oh—they don’t really wash off if you put them under the tap. I tell people not to waste their time; I never wash unless there is gross dirt or debris, and that is only to avoid chipping a tooth.”

Dooh. I knew that. Washing really doesn’t do much when it involves fresh produce. And if Consumer Reports really wanted to validate their study – and their advice to rewash bagged salad, which is still being repeated ad nauseum – they would have washed bagged salad and then run the same tests for bacterial presence.

Somewhere in the deep, dark recesses of my brain there was some recollection of this because, as I told Darla Carter of the Courier-Journal of Louisville, Kentucky, the study was “almost useless to consumers.”

“I can find indicator organisms almost anywhere, so what? … Indicator organisms generally aren’t going to make you barf.”

Powell said washing bagged salad has no proven value and poses the risk of cross-contamination.

“They’re giving advice that’s contrary to what is generally accepted,” he said.
When it comes to ensuring the safety of problematic produce, such as leafy greens, tomatoes and cantaloupe, “the focus has to be on the farm and then all the way through the system,” Powell said. “Prevention is much better.”

And washing doesn’t do much. If only I’d said that at the time.
 

Are reusable bags really a food safety concern?

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The Canadian Plastic Industry Association (likely feeling reduced sales due to the popularity of reusable cloth bags) says that reusable bags are a public health risk. In a press release yesterday the plastic dudes touted the results of a bag swabbing study conducted earlier this year. Cited as the first study of its kind in North America, the plastics industry swabbed a whopping 25 bags, with 4 controls looking for anything they could find.

Swab-testing of a scientifically-meaningful sample of both single-use and reusable grocery bags found unacceptably high levels of bacterial, yeast, mold and coliform counts in the reusable bags. The swab testing was conducted March 7-April 10th by two independent laboratories. The study found that 64% of the reusable bags were contaminated with some level of bacteria and close to 30% had elevated bacterial counts higher than the 500 CFU/mL considered safe for drinking water.

Um, yeah except that coliform isn’t an indicator of really anything in a shopping bag. It’s a great indicator of water quality, but not great for food (coliforms are all over the place, including on produce). And mean relatively nothing.

The lack of real data is probably why it was reported in CFU/ml (a water measurement — pretty hard to tell what a ml of a shopping bag represents). The most telling data was that no generic E. coli or Salmonella was found.

Not the best methodology design. Or reporting of results.

Not to be phased by the lack of data, Dr. Richard Summerbell, Director of Research at Toronto-based Sporometrics and former Chief of Medical Mycology for the Ontario Ministry of Health (1991-2000), who evaluated the study results said, "The main risk is food poisoning. But other significant risks include skin infections such as bacterial boils, allergic reactions, triggering of asthma attacks, and ear infections."

Wow. Maybe if you’re talking about yeast and molds? But when it comes to pathogenic microorganisms the data just isn’t there.

We use reusable bags all the time for our shopping and take a few precautions to maybe reduce any potential risks: we keep them dry; wash them every couple of weeks and use one-use bags for raw meat.