When I posted about bedbugs, it comes across my mind in sharing my true experience on fleas infestation.
My brain is still fresh on how terrible the unattended documentation store was infested.
Despite than only providing solutions to customers, as a specialist, we shall try our best to find out the root cause of the infestation. Other than fleas infestation, we found out the area was actually badly infested with rats. As the documentation store was not occupied for a long period, it gives you a good illustration that the store was not well maintained.
When it's not well maintained, you will actually find out there are a lot of entry points for the rats. If there's one rat infested with fleas, you will get high chances for the rest of the rats to be infested; in fact the left unattended documentation room has become the breeding ground for the rats.
So, if you are asking what's the root cause of fleas infestation; Here's one of the answers. It can be introduced by your pet or pest!! And, that's what we call cross infestation. So, please ensure you keep your area clean.
Disclaimer: All the above photos are extracted from internet and do not belong to BI Guidance Sdn Bhd.