Via a reader tip comes this news that shellfish from Korea has been banned in the US due to polluted water:
Consumers should not eat shellfish from South Korea and retailers should stop selling it, federal and state regulators said Thursday.
The Food and Drug Administration yanked firms that transport Korean shellfish off its list of approved shippers on May 1 and said it may launch “a fairly extensive recall of the product” — specifically fresh, frozen or processed oysters, clams, mussels and scallops.
An agency analysis of the Korean shellfish program found unacceptable water pollution levels in shellfish-growing areas and periodic detection of norovirus, a common cause of acute gastroenteritis, or inflammation of the stomach and intestines. [Washington Post]
You can read a lot more at the link but it sounds like more people have already gotten sick from these contaminated shellfish than people in Korea made sick by eating US beef.