A new strain of the toxin and the previously unknown strain of bacteria which makes it was recently discovered in California. Some controversy is brewing up as well, since the scientists are not, as of yet, releases the DNA sequences responsible for the toxin out of fears that terrorists could use it to make a bioterror weapon.
For those who don’t know (and don’t want to read the article), botulism toxin is pretty much the most acutely toxic substance known. There are several strains of the toxin (as several species of bacteria make it) and it varies in lethality. But in general tiny, tiny amounts of it (only about a dozen parts per billion if inhaled, less if injected) is enough to kill someone.