Panleuk is feline parvo, it’s the P in the FVCRP vaccines that all kittens (should) get.Hi, welcome to the cat site! I honestly didn't know cats could get parvo. I looked it up and apparently they do! Also known as feline distemper but , it sounds a lot like what dogs get and just as hard to get rid of. I found this link and it seems to cover it pretty thoroughly. Can Cats Get Parvo Virus? - Cat Kingpin Hope this helps!
Hi. So sorry for your loss. All data I have read about it says it can stay in the environment for as long as a year or more. Some data says bleach works and other information says it is not effective enough. All said, the best way to ensure it is not spread is through vaccinating all cats/kittens expected to be in your home in the future, if they have not already been vaccinated. I have also read the full series of boosters should be done to ensure kittens/cats are fully protected, but I have read other information that indicates immunity begins after the first vaccination. You could ask your vet about that aspect, as well as their opinion of the bleach.
I do know it can be transferred from location to location by you - such as on your shoes or clothing. So, that is another consideration to keep in mind.