My friend Rachel, who has been staying with me for the past few months, is allergic to cats and asthmatic, but she grew up with lots of cats. They would have like five or six cats at a time. She LOVES them.
Anyway, when Rachel moved in with me, she didn't have any cats and she explained to me that all she needed to do was "adjust" her medication and she would be fine. She hasn't had any problems and believe me, she is
always snuggling with these kitties.
I also vacuum several times a week, so I guess that helps too.