I have heard this. When Kaysha came to California with me, the one thing the vets there asked was, was she around any cleaners for the floors, swiffers, any store bought floor cleaner. She was so sick! They were surprised she made it They said the only explanation is; there is none since the only thing i couldn't answer was were the floors cleaned. Obviously its bad to say it was a swiffer but it didn't help they had one... I have heard it elsewhere but like somebody said there is no proof so I don't want to be a finger pointer. Just thought I would add I heard it too