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Re: E. coli - one more example
In a message dated 11/4/2002 4:47:52 AM Pacific Standard Time, wiegand@LUFA-SPEYER.DE writes:
uhhuhh, we find them quite often in cheap foodstuff (when MBM
was still allowed, we found them regularely in 70% of mixtures
containing MBM) with the usual aerobic colony counts of 10 ^8 to
10 ^9 / gr - incubation in usual temperature chambers (overgrown in
foodstuff with colony numbers above). simple pretesting by vicam,
our experienced technicians have a success rate of about 90%
counterchecked by serology.
And what was the oxygen concentration in the cheap foodstuffs?
And wait a minute on the "aerobic plate counts". There is EVERY probability that the organisms that grew on that aerobic plate were present as SPORES in the food you were talking about.
Can you find DNA of other organisms in foods with E. coli growing? Sure. I'm not disputing that. But, if the conditions in the food were too low in oxygen concentrations for them to grow, they weren't growing and competing with the E. coli IN THE FOOD.
That's the problem with plate counts - you have no idea of the metabolic condition of the organisms in the original habitat once they grow on a plate. You have no clue.
President, Soil Foodweb Inc.