What should homeowners expect regarding adult fleas after an indoor flea treatment?

Homeowners can anticipate that adult fleas may continue to emerge from their pupal cases for a duration of up to 21 days following an indoor flea treatment. This occurs because flea development includes a pupal stage, during which the larvae encase themselves in cocoons that can remain dormant until conditions become favorable for emergence. Environmental factors such as warmth, vibration, and carbon dioxide from pets or humans can signal to the fleas that it is time to hatch. Thus, even after a treatment has been applied to eliminate adult fleas, a homeowner might still observe adult fleas coming out of these pupal cases for weeks afterward.

The other choices don't align with the typical behavior of fleas after treatment. Immediate elimination would be unrealistic due to the lifecycle of fleas, which includes resilient stages like the pupa. Expecting no fleas for at least a month is misleading, as it may inaccurately inform homeowners about the ongoing emergence of fleas that can happen within that initial three-week period. The idea of re-infestation within a week does not capture the complexity of the flea lifecycle and suggests a lack of understanding of how the life stages interact post-treatment.