F.I.T Kitten disease

My 6 month old Bengal kitten was just diagnoised with F.I.T and was called a poor doer. Can you please explain what this means?

[chieftrina]

My son called tonight and his cat died from the same thing! What is it and why?

[Thomas Dock, CVJ, Vet. Technician]

Just a quick clarification...are you certain that the diagnosis was F.I.T and not F.I.P. or even F.I.V??

[zodiacqueen]

Also, please clarify what "poor doer" is?

[Jade59]

I am thinking the poster is trying to say Failure to Thrive.  I too, am waiting to see what this is...