Some quite modest sized ones have even been seen in.
The chances of a brown recluse or black widow spider bite in my state in October was ludicrously small.
The doctor gave me a severe telling off and said I was on the brink of blood poisoning and if I had left it another 12 hours I would have put myself in intensive care and been at risk of dying.
It is the bite of the adult female black widow from her much larger venom sacs that can cause some problems.