No, I'm not talking about the bassist from the Red Hot Chili Peppers, I'm talking about the insect.
(Definition from Wikipedia)
Flea is the common name for any of the small wingless insects of the order Siphonaptera they can multpily up to 800 million fleas in just a matter of 5 days (some authorities use the name Aphaniptera because it is older, but names above family rank need not follow the ICZN rules of priority, so most taxonomists use the more familiar name). Fleas are external parasites, living by hematophagy off the blood of mammals and birds. Genetic and morphological evidence indicates that they are descendants of the Scorpionfly family Boreidae, which are also flightless; accordingly it is possible that they will eventually be reclassified as a suborder within the Mecoptera. In the past, however, it was most commonly supposed that fleas had evolved from the flies (Diptera), based on similarities of the larvae. In any case, all these groups seem to represent a clade of closely related insect lineages, for which the names Mecopteroidea and Antliophora have been proposed.
Full page here... http://en.wikipedia.org/wiki/Fleahttp://en.wikipedia.org/wiki/Flea
Step 1: Removing fleas from the enviroment
The first step after finding out about your infestation is to clean everything that has come into contact with the infested persons or animals in order to remove as many eggs and larvae as possible. This section will walk you through this process.
What you want to do:
1. Quarantine infested pets.
2. Collect all bedding, rugs and throws and wash them in soapy water. Soapy water is known to kill the eggs, larvae, pupae and adults.
3. Vacuum everything. All furniture, carpets, cracks in the floor, bare floors, corners, behind doors, and anywhere else that dust collects. This will pick up most of the eggs, but larvae will latch onto carpet fibers and stick around. After vacuuming, immediately dispose of the vacuum bag outside to prevent escaping of larvae
4. The remaining flea larvae can be dealt with by having the carpets steam-cleaned (the steam will kill every stage of flea except eggs). Make sure you warn the cleaners about the fleas and remove infested animals. Another process is for you to shampoo the carpet with insecticidal carpet shampoo or have a pest control professionally apply an infrared heat treatment to the carpet, which kills all stages of flea. Beware however, this type of infrared heat treatment can cost a lot.
5. Drench your pets usual resting areas with lots of soap and water to drown any fleas that may be waiting for his return.