I’m not quite sure, Vanessa. It seems e cuniculi is far from being fully understood (even if there have been quite a lot of progress these last 10-15 years or so).
I listened to an e. cuniculi webbinar by Molly Varga last spring, and she said a vaccine might be made. She said preventative treatment with panacur for 9 days every 6 months for positive rabbits is “authorized” and I’m guessing she meant in the UK. She said not to treat house buns that test negative for the parasite. And that treatment/ no treatment always depends on the situation.
I remember there were talk here in Sweden about treating all buns routinely with Panacur – but I don’t know why that didn’t become standard practice. I’ll try an ask my vet when i take Bam in for his vaccination on Oct 11.
So until then, I’m guessing wildly here, but as you are saying yourself, there is this veterinary ethical principle that you should never do “unnecessary” procedures on animals. The known side-effects of fenbendazole (Panacur) are few and rare, but there are some and there are even some that can be serious, although, it seems, that’s extremely rare (Dana Krempels has written about it here: Panacur dangers). That combined with the notion that it’s uncertain if fenbendazole will have a significant preventative effect might be why it’s not recommended for all buns.
I’m sorry you lost Merlin. I’m glad Lancelot is fighting on.