That includes manufactured or processed beef products, which are the most likely to enter the Brazilian and Argentine markets.
This is in response to an appalling report that shows very sick cows, which are unfit for consumption (because of much higher risk of diseases and also a protein-imbalance that can poison some people), still being processed alongside with healthy cows.
Not only that, some video has been shown in local media showing these sick cows being stabbed with machinery to make them walk to the slaughterhouse.
The MERCOSUR ban might not be the worst development, as imports are not particularly high since the block is a big meat producer itself, however. If Japan and other countries ban US beef products, all of those combined could be devastating for the North American industry.