Pest profile

Human Flea

Pulex irritans · Siphonaptera: Pulicidae[2]

The human flea gets its name from a long association with people, their homes and the animals that live with them.[1]

Human flea adult, a reddish-brown flea with a rounded head, seen from the side
Human flea adult, a reddish-brown flea with a rounded head, seen from the side. (c) carnifex, some rights reserved (CC BY) — via iNaturalist, CC BY 4.0

How to identify it

  • It has a rounded head with a single bristle under the eye and no bristle combs below the eyes or behind the head.[1]
  • Larvae are legless, whitish to pale tan grubs with a hard head and no eyes.[1]

Look-alikes

Look-alikeHow to tell them apart
Oriental rat fleaIt lacks a hardened ridge over the second pair of legs that the oriental rat flea has.[1]
Cat fleaCat fleas have bristle combs on the head; the human flea has none.[1]

Where it lives

It's reported worldwide but isn't known to be established in Florida, where it's often confused with a close relative, Pulex simulans.[1]

US map: public records from 6 states since 1990 (GBIF).

Biology and life cycle

Development from egg to adult averages 63 to 77 days.[1]

Hosts include dogs, cats, rodents, pigs, carnivores and people.[1]

Health risk

Bites cause red bumps and dermatitis; it's a potential vector of plague and murine typhus bacteria and a tapeworm.[1]

Control

Sanitation

Vacuum carpets and clean bedding and furniture, treating cracks and crevices where fleas develop.[1]

Traps and physical control

Where small mammal pests are the source, trapping them removes hosts.[1]

Pesticides

Make sure pet dogs and cats are treated to reduce their flea burden.[1]

Common questions

Why do fleas keep coming back?
All life stages must be controlled, or there's a high risk of reinfestation.[1]
Do human flea bites itch?
Bites commonly cause red bumps and dermatitis where flea numbers are high.[1]

Sources

  1. University of Florida IFAS Extension (Featured Creatures), “Human Flea, Pulex irritans (EENY-798).” edis.ifas.ufl.edu/publication/IN1383 (accessed 2026-10-06)
  2. iNaturalist, “Pulex irritans taxon page (order and family).” www.inaturalist.org/taxa/308321 (accessed 2026-10-06)

Updated 2026-10-14. Built from sourced records. Spot an error? Tell us.