If a customer has fleas but no pets, what type of flea is likely present?

The presence of fleas in a scenario where a customer has no pets suggests the likelihood of the rat flea being present. Rat fleas, scientifically known as Xenopsylla cheopis, often inhabit environments where rodents are prevalent. These fleas are adept at living off of their rodent hosts and can readily jump to humans if they come into contact.

While cat and dog fleas can generally be associated with their respective animals, their typical hosts would not be present in this specific situation. The human flea, though historically relevant, is less common today and primarily associated with humans living in close quarters with one another or in unsanitary conditions. Therefore, without the presence of pets, a flea infestation can be attributed to the activities of rodents in the vicinity, making the rat flea the most plausible option. Understanding pest behavior and host relationships helps in accurately identifying and addressing flea problems in environments lacking common domestic animals.