from what I read, not all cats have it and since most cats in HK are housebound and have never been out, the chances of them picking it up is slim. In any case, if your cat has it and you have owed it for a while, then you've probably gotten it before, have antibodies and would not get it again. Think what you have to worry about is handling cats which you do not own and not washing your hands properly thereby ingesting the virus accidentally.