David Goldstein has been watching closely the tainted gluten/melamine story, and he has even more disturbing news:

During an ongoing media teleconference call, USDA/FDA officials have revealed that melamine-tainted "protein concentrate," imported from China, contaminated fish meal manufactured in Canada. The tainted fish meal was then distributed to an unknown number of fish farms in the US and Canada.

Other revelations:

• 50,000 swine have been quarantined in Illinois due to suspect feed.
• The tainted "wheat gluten" and "rice protein concentrate" at the center of the pet food recall, was actually misrepresented as such. Further tests have determined that it is wheat flour, adulterated with melamine.

UPDATE:
FDA refuses to reveal how many fish farms and in which states. But you can be pretty damn sure that NW farmed salmon is likely on the list.

More from David: FDA = Faith-based Dining Administration?