Extreme flea infestation can pose health problems to people and pets particularly because these parasites survive by sucking blood.
Bed bug bites are often mistaken for hives, mainly because they are both due to an allergic reaction.
A bait station is not the same as a mouse or rat trap; rather, it is a clever device that holds a bait block. The bait block looks and smells like rodent food but contains poison.
You must answer the question of why the flies are there in the first place. In the case of small flies, it usually means there are structural defects or sanitation problems inside the building...