The mode of infestation starts with some individuals being carried unknowingly through luggage, clothing, and some camping gear such as sleeping bags and tents. They easily establish a colony once they set their foot on appropriate spots. Contact with wild animals or if you have animals at home may also increase your chances of being infested with this parasite.
Transferring from one place to another especially if this is the very nature of your job also augments the possibility of getting an infestation from this parasite. Guests may also serve as potential source of this parasite especially if they stayed in a hotel formerly infested with this insect. With a variety of factors for this animal to reach your house, it is not at all surprising if some bugs are already considering your home as their perfect domicile.