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.
"When I think of Mick Jagger still singing that he can't get any satisfaction in over forty years of being in the Rolling Stones, I have to conclude that he's either lying or not all that bright." -- Henry Rollins