Termite infestation is difficult to detect as they work from the inside to the outside. Termites need cellulose to survive and your belongings like wood and paper are majorly at risk.
Bed bugs can thrive almost every where. This makes it very difficult to find them too. If you are having a severe bed bugs problem in your home or office they could be just about anywhere.
Rats are various medium-sized, long-tailed rodents of the super family Muroidea. Rats are considered as carriers or transmitters of more human diseases than any other life form, except maybe the mosquito.