A spider infestation is harder to anticipate than most other infestations. Spiders tend to favor dark, poorly-lit places throughout your home. The best way to prevent them from filling your home is to keep it clean and make sure you check your basement, attic, and other storage places frequently. Spider bite is dangerous. My brother has been treated for long as he was bitten by a spider and I think it was poisonous.We then took the help of a pest control company exterminator elk grove, on our aunt recommendation, and their people helped us to get rid from them.