Wiktionary
n. A species of flea, (taxlink Pulex irritans species noshow=1), with a variety of hosts, that is relatively prevalent among humans.
Wikipedia
The human flea (Pulex irritans) is a cosmopolitan flea species that has, in spite of the common name, a wide host spectrum. It is one of six species in the genus Pulex; the other five are all confined to the Nearctic and Neotropical regions. The species is thought to have originated in South America, where its original host may have been the guinea pig or peccary.
Usage examples of "human flea".
Like the house rat, the house mouse, the human flea, and the cockroach, this other intimate household companion had suffered only a considerable reverse.
We humans finally wrested ourselves and our sanity from the human flea.
A human flea being whirled around inside the complex machine of the city.