Thank you so much for answering my question. I think my adult kitties are safe, as they have been vaccinated every year.
Unfortunately, i've noticed that the thirds sister in the kitten litter does not have a great appetite...I may have to take her to vet next :(
I am certainly earning my wings for petsitting this week!
Wow...it sure sounds like you have your hands full at that house!!
Feline Panleukopenia is a viral disease that is similar to, and thought to be the precursor to, canine parvovirus. These viruses are very hardy in the environment and can be carried around with you on your shoes and clothing. It is very contagious among cats and outbreaks are often seen at shelters and rescues were many of the cats are not fully vaccinated.
Now, if your cats have all been vaccinated more than once for panleukopenia (or feline distemper) in the past, odds are that you don't have anything to worry about. Just monitor for anybody who decides to that they don't want to eat. Anorexia is one of the early signs of these type of diseases.