Please call your vet about this. If you don't have one, get one. Call friends who have pets and ask them who they recommend.
If you can get a 'fresh' sample, take it in to the vet. Use a clean sandwich baggy on your hand like a glove, and pick some up wearing the 'baggy glove'. Then peel off the 'glove' and tie the top tightly.
Please keep us posted on how your kitty is doing.
"I have six locks on my door all in a row. When I go out, I lock every other one. I figure no matter how long somebody stands there picking the locks, they are always locking three." -- Elayne Boosler