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Adult fleas can live from a few days to about two weeks without a host. If pets are not available, fleas may feed on rodents or people. While adult fleas need a blood source to survive, flea pupae can lie dormant for up to a year in optimal conditions. Therefore, cleaning and treating the infested area is essential to prevent pupae from surviving and hatching later.

No, you don’t necessarily need a flea bomb in every room of your home, but that largely depends on the level of infestation you have. A single fogger can likely treat most of your space, unless you have a lot of square footage to cover. However, you may need to use one or more per room depending on your needs, which an exterminator can likely determine. 

It is very difficult to remove a colony entirely without using some kind of insecticide. However, some treatments are safer than others. Diatomaceous earth is a non-toxic powder application that creates barriers that insects can’t pass through. Some pest control companies offer liquid nitrogen treatments to freeze out termites without using pesticides. Some chemical treatments are safer to use around plants, water, and wildlife than others. Bait stations are generally less damaging to the environment than sprayed termiticides.

For years, it was believed that hobo spider bites were incredibly dangerous, causing flesh-eating wounds. But the rumors of their bites were greatly exaggerated, and there's been no real evidence showing a connection between a hobo spider bite and necrotizing wounds. 

That said, the spiders can and do bite, usually as a defense response. They won't attack you unprovoked, but if you take them by surprise and get close enough, they may bite you. Their bites may cause some minor irritation or itchiness.