NEMATODE
HOST(S)
MODE OF ENTRY
USUAL SITE OF
INFESTATION
Anyclostoma duodenale)
Man
Through the skin of
Small intestine
(Old World hookworm)
a barefoot person
Necator americanus
(New World hookworm)
Ascaris lumbricoides
Man
Food or drink
Small intestine
(large roundworm)
contaminated with
(also lungs,
feces by flies or
trachea, and
fingers
other organs
Enterobius (Oxyuris)
Man
Ingestion through
Intestine (females
vermdcularis (pinworm)
contaminated hands,
migrate to anus
clothing, bed linen, etc. to deposit eggs)
Strongyloides stercoralis
Man
Active penetration of
Intestinal mucosa
larvae through the skin
Trichuris trichiura
Man
Contaminated food
Cecum, appendix,
or drink
upper colon
(whipworm)
hog,
larvae imbedded in
encystment in
Rat,
Ingesting encysts
Intestinal tract
Trichinella spiralis
man
flesh
muscle fibers
Wuchereria bancrofti
Man
Through the bite of
Lymphatic system
(filarial worm)
a mosquito harboring
and connective
the larvae
tissue
Brugia malayi
(filarial worm)
Onchocerca volvulus
Man
Through the bite
Skin and sub-
(blinding filarial worm
of the black fly
cutaneous
or buffalo gnat
tissue, especially
of head and neck
Loa. loa
Man
Through the bite
Subconjunctival
(African eye worm)
of a fly
and subcutaneous
tissue
Dracunculus medinensis
Man
Ingestion of infected
Skin of the legs
(guinea worm)
water fleas
(copepods)
Table 2-10. Principal nematodes affecting man.
MD0151
2-38