Vacuuming kills 100% of flea eggs, larvae, and pupae. And it kills 96% of adult fleas. Brushes, fans, and strong air currents violently hurl the fleas against the vacuum’s internal surfaces. There’s no need to burn or freeze vacuum bags. Likewise, adding insecticides to the collection chamber is unnecessary.
Vacuuming Kills Fleas
100% of flea larvae and pupae are killed when vacuumed up. Eggs weren’t studied, because they’re fragile and the researcher was certain they wouldn’t survive. Adult fleas are the most hardy stage, but vacuuming still kills 96% of them. Those that survive get damaged and won’t live long.
As fleas are removed from carpets, they’re violently slammed around the vacuum’s internal surfaces by fans, beater-bars, brushes, and strong air currents. Death occurs by the time they reach the collection chamber. Pupae aren’t even recognizable when the vacuum’s bag was cut apart. The study’s author stated, “No matter what vacuum a flea gets sucked into, it’s probably a one-way trip.”
Adult fleas in the environment likely haven’t fed yet. Once they’re on a suitable host, they stay there. The fleas feed, mate, and lay eggs on the host’s body. Fleas that haven’t fed aren’t able to lay eggs. Thus, any surviving fleas in the vacuum won’t be able to lay eggs.
Vacuums cause considerable physical trauma to fleas. Surviving adults are likely critically damaged and unable to move well. It’s improbable that they’d be able to escape the vacuum and acquire a host. Instead, they’ll soon starve to death. After emerging from cocoons, fleas must feed within a week in home environments. They’ll starve even sooner, in around 4 days, if removed from a host. After feeding, fleas become dependent on a constant supply of blood.
Sanitizing is Unnecessary
Concerns about fleas surviving in vacuums are unfounded. There’s no need to take further steps to sanitize the vacuum’s bag or bagless canister. Examples: Freezing or burning the vacuum bag, throwing away the bag after every vacuuming, or adding insecticides to the collection chamber (e.g. moth balls, flea collars, or diatomaceous earth). It’s also potentially dangerous to use insecticides in a manner inconsistent with their labeling.