Seems a little strange to me. There are any number of suspicious items they could be concerned with. I thought this was a joke at first.
What's next? Hassle anybody carrying a plane ticket? Oh yeah, they already do that.. it's called security.
50% of this is genuine concern and care, the rest is just to add to the overall trend of trying to keep everyone scared to death.. it helps the economy. People fear the worst, they buy extra supplies. Stories like this are planted to keep the fear up.
Then there's the flipside.. mad cow. A real threat which they try to downplay because it involves a major industry losing $$$.