The results of the autopsy are - the pig died of acute mycotoxin (fungal) toxicity most likely a Fumonisin (fusarium monif?

mainly found in corn) produced by fungus in feed.
(To test the food for the fusarium would cost around £100.)
I asked if it could be from feed 3 weeks prior - yes
Is it possible for 2 pigs to eat the same stuff and 1 die and the other ok - yes
Is there any treatment if this one shows signs - no
Also present some worm damage in liver - would be ok to eat.
Looking at other threads it appears very dificult to avoid buying Farmgate or other feed so I supose we have to hope this was a one off problem. There's no alternative to Farmgate near us here.
Oh dear - the way I see it this pig could drop dead anytime - or not. So her sister arrives on Sunday hopefully the introduction will go smoothly, we can't give them seperate areas unfortunately.
Thanks for all your interest and I hope this doesn't happen to any of your pigs.