That's why I am worried. I might to have been clear in my post. I should have said happy and healthy snakes flick their tongue.
I'll look into this.
Yafe is returning to the vet for a re-check and/or to get more antibiotics on Wednesday (5 days). That will give time to see if things clear up after the last injection.
I am not happy at all. Very worried about other things going on now beyond just an RI.