microscopic pinworm eggs is the typical way most people become infected.
The eggs travel through the stomach to the
where they hatch. Within 2-4 weeks, the adult female pinworms begin migrating
from the large intestine to the area around the rectum. There they lay
new eggs which trigger itching. Touching or scratching the affected area
transfers the eggs to the host’s fingers, which can spread them practically
anywhere. When another person inadvertently ingests these eggs, the process
known as retroinfection–begins all over again.
are deposited on perianal folds. Self-infection occurs by transferring
infective eggs to the mouth with hands that have scratched the
perianal area. Person-to-person transmission can also occur through
handling of contaminated clothes or bed linens. Enterobiasis may
also be acquired through surfaces in the environment that are contaminated
with pinworm eggs (e.g., curtains, carpeting).
small number of eggs may become airborne and inhaled. These would
be swallowed and follow the same development as ingested eggs.
ingestion of infective eggs, the larvae hatch in the small intestine
and the adults establish themselves in the colon.
time interval from ingestion of infective eggs to oviposition by
the adult females is about one month. The life span of the adults
is about two months.
females migrate nocturnally outside the anus and oviposit while
crawling on the skin of the perianal area . The larvae contained
inside the eggs develop (the eggs become infective) in 4 to 6 hours
under optimal conditions. Retroinfection, or the migration of
newly hatched larvae from the anal skin back into the rectum, may
occur but the frequency with which this happens is unknown.
to buy Reese's Pinworm Medicine.
• What is Pinworm
• How do you get
• The Symptoms
• How to Identify
Image of a Pinworm.
• How to Eliminate
• Preventing Reinfestation.
• User Instructions/Dosage