Several contain enough botulinus toxin to wipe out the entire population of Los Angeles.
The poison which causes botulism is produced by the Bacillus botulinus, which flourishes only where there is no air, as inside a sealed jar or can.
The only antidote for botulism, and only moderately effective at best, is a Ledejle Laboratories antitoxin (made by injecting botulinus toxin into horses and extracting their .