Pthirus pubis (commonly referred to as pubic lice or “crabs”)
Pthirus pubis Details:
Type:
Ectoparasite (parasitic insect)
Category:
Arthropods (Insects)
Transmission Type:
Direct close contact (most commonly sexual contact)
Primary Target Area:
Pubic hair (may also affect coarse hair such as armpits, beard, chest, eyelashes)
Lifecycle Form:
Nit (egg), nymph, adult louse
Incubation Period:
Eggs hatch within 6 to 10 days; itching may begin 1 to 3 weeks after infestation.
Transmission:
Pthirus pubis spreads primarily through close physical contact, most often during sexual activity. The lice grasp coarse hair and feed on human blood.
- Sexual contact
- Close personal contact
- Rarely through shared bedding or clothing
Pubic lice do not jump or fly; they crawl between hosts.
Pthirus pubis Is Found In
- Worldwide distribution
- Sexually active populations
- Households with close contact exposure
Infestation can occur in adults and occasionally adolescents.
Is Pthirus pubis Common?
Pubic lice infestation (pediculosis pubis) is relatively common among sexually active individuals. Rates vary by region and population.
Information about Pthirus pubis:
Pthirus pubis is a small parasitic insect adapted to coarse human hair. It feeds on blood several times per day and lays eggs that attach firmly to hair shafts.
Lice typically survive less than 1–2 days away from the human body.
Diagnosis is usually made by visual identification of lice or nits in affected hair.
Possible Symptoms of Pthirus pubis
- Intense itching in the genital area
- Visible lice or eggs attached to hair
- Skin irritation or redness
- Small bluish spots at bite sites (in some cases)
Some individuals may have mild or minimal symptoms initially.
How long does Pthirus pubis last (Duration)?
Without treatment, lice can continue reproducing and persist indefinitely on the host. Adult lice live about 30 days on the body.
Anything Else Relevant to Pthirus pubis
- Commonly called “crabs” due to appearance
- Primarily affects coarse body hair
- Spread mainly through sexual contact
- Does not transmit major systemic diseases
- Partners may require evaluation and treatment
High Risk Groups for Pthirus pubis
- Sexually active individuals
- People with multiple close-contact partners
- Household members of affected individuals
Preventing Pthirus pubis
Prevention Measures May Include:
- Avoiding sexual contact with infected individuals until treated
- Not sharing bedding, towels, or clothing
- Washing clothing and linens in hot water after diagnosis
- Prompt treatment of affected individuals and close contacts
Added Complications from Pthirus pubis
Possible Complications (in some cases):
- Secondary bacterial skin infection from scratching
- Persistent itching
- Eyelash involvement (rare)
Medical evaluation may be considered for persistent irritation or suspected complications.
