@CavyConnoisseur
I recently lost Toffee because of this. It was masked due to fly strike and we were treating that. I hadn't seen any symptoms but the only reason I know is because the vet did an autopsy on him because I just couldn't make sense to any of it.
I don't know what different types of gut infections their are but the vet believes something could have - I repeat could have crawled up and caused the infection, but it was again masked by his previous owners not giving feeding him hay apart from the sneaky stuff he got when I jumped over the fence to him.
Mine are all treated with Xeno450 regularly to keep things at bay but frankly you just never know what's round the corner.