The salmon mousse?
Unfortunately, it sounds like someone brought something that was made from home-canned goods that may have gone bad (improper canning/storage methods - possibly low acid, could be veggies or meat)
A college Bacteriology course put the “terror” in my mind re: the source of food, especially green beans...Thanks, Dr. Harned, it’s been 50+ years, but your lesson is still in the front seat of my mind!
Yikes, my next door neighbors just moved from there last summer.
Bad pork chop.
They must have a suspect for the source to use the specific antitoxin. There are several types of botulism and some are endemic overseas and the antitoxin doesn’t cross protect in others. I remember a Type E outbreak in Knoxville from eating fish that had set out too long and the TNANG had to fly a fighter jet from Alcoa to France and back to get the antitoxin back to save the victims.