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Up to today, the FDA has no idea about the source of the salmonella contamination. The reason for the delay in tracing the source is that the department doesn't have a traceability system in place, unlike the European Union which traces every single produce from farm to the table at a restaurant.

Are there any mistakes?
Thanks.
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I still can't get my head around the idea of a tomato being contaminated with salmonella. Was it laid by a chicken?
HuevosWas it laid by a chicken
HAHA. I think your disbelief is understandable because we normally hear samonella is spread through eating raw eggs.

Well, since there's no evidence that tomato is the culprit, it can be anything.
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New2grammarWell, since there's no evidence that tomato is the culprit, it can could be anything.
Thanks, Huevos. Since you made no correction to my original, I assume it's correct.
New2grammarThanks, Huevos. Since you made no correction to my original, I assume it's correct.
Just a couple of minor things:
New2grammarUp to today, the FDA has no idea about the source of the salmonella contamination.
"Up to today" sounds like the problem is now solved. So, if it is solved, "Up to today the FDA had no idea...", and if not, "Still today the FDA has no idea...".
New2grammarevery single produce
To me "produce" has the feel of a mass noun so I think I would say "all produce" or "every single product".
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Good points. Thanks, Huevos.