After finding a ‘single, extremely tiny, larva-looking worm’ in the ‘cracks’ of her mattress, this reader wonders if this is a flea or not. She is already in the process of treating her cat for fleas, but has not seen a single adult flea in over a month, and so wonders if she will need to treat her house again for fleas. She adds that she never actually saw any fleas around her house, but only on her cat.