Hi there - Just wanted to mention that I also have been a volunteer at animal shelters (I'm now helping a rescue - all of our cats are in foster homes). You maybe already know, but in case you don't - some diseases/illnesses are transferable to your cats at home through your clothes and your hair so the fact that you lost your two sweet cats may have to do with something you brought home from the shelter. Sad but true - if your shelter is run like so many of them, the people abandoning their animals are not always truthful of the reason WHY they are dumping them (often their cat or dog is ill and they just don't want to pay or care for them anymore, or be responsible if euthanasia is necessary). When I was with the shelter, as soon as I arrived home I would change (put all clothes in a closed laundry room), including shoes, and have a shower. Things like Rhino is airborne and contagious, Panleukopenia is also, and they can be fatal.