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Pick
a tomato in the blazing sun and plunge it straight into cold water. If
that happened on the way to market, it might be contaminated. Too big
of a temperature difference can make a tomato literally suck water
inside the fruit through the scar where its stem used to be. If salmonella happens to be lurking on the skin, that's one way it can penetrate and, if the tomato isn't eaten right away, have time to multiply.
That doesn't mean people shouldn't wash their tomatoes — they should, just probably not in cold water.
But
as the Food and Drug Administration investigates the nation's outbreak
of salmonella from tomatoes, the example shows the farm isn't the only
place contamination
can occur — and checking things like water quality and temperature
control in packing houses and other supply stops is one key to safety.
Raw fruits and vegetables are crucial to a healthy diet. But they're also the culprits in a growing list of nasty outbreaks: E. coli in spinach and lettuce.
Stem/noun/:
central stalk of a plant; petiole; slender part which connects or supportsساقه، تنه، ريشه
Contamination/noun/:
pollution, something which contaminate آلودگي
Culprit
/noun/:
the reason for a particular problem or difficulty
مقصر
Penetrate
/verb/:
pass into, enter, pierce; permeate سرايت کردن... رسوخ ،نفوذ کردن در،بداخل
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