Thanks for all the good advize!!

We have NO carpetting in the house, because both our children are allergic to dustmites. All tiles here.
The vet said that it isn't necessary to do any special cleaning in the house. But I don't believe that at all; so today I have been changing all the beds (humans), and lots of vacuuming has been done too. I don't think it is any use though to vacuum fleapowder, because we have a central vacuuming system. Meaning: there is a central huge container for all the dirt in our garage, so there is no dustbag on the vacuumer itself, there is only a long hose that can be connected to the system in every room of the house (sorry for the long and maybe bad explanation, English isn't my mothertongue).

I feel so bad for not having noticed this flea situation sooner.... . My cats get Frontline on their neck every 6 months; I had NO idea that this wasn't enough...! I also interpreted the bites as musquito bites.

I hope I can get this under control as soon as possible

Thanks again for your help!!!

ps. Only 2 of our cats are indoor-outdoor cats: Maya & Inka. The other 2 Zazou & Snoopy are strictly indoor now (remember Zazou's missing?) !!