(^182) CHAPTER 11 The Eukar yotes
- Ancylostoma duodenale: A. duodenale, also known as the Old World
hookworm, is similar to N. americanus, but is native to Southern Europe,
North Africa, Northern Asia, and parts of western South America. - Ancylostoma braziliense: A. braziliense is a hookworm that exists in
cats and dogs and causes cutaneous larva migrans, which is also known
as creeping eruption. Its eggs are passed in feces and the larvae develop
in the soil. The larvae can tunnel into the epidermis of humans and can
cause an infection to develop. - Ancylostoma caninum: A. caninum is a hookworm that exists in dogs
and frequently infects puppies. It eats away at the tissues in the small
intestine and sucks blood from the dog. This can result in diarrhea,
weight loss, anemia, and death. The larvae can tunnel into the epidermis
of humans and can cause an infection to develop.
PINWORMS
Pinworms can be up to 10 millimeters long and live in the large intestine.
Female pinworms crawl out the anus to lay eggs on the perianal skin.
Afterwards, she dies. Pinworms infect about 10 percent of humans, although
the person may not know he or she is infected: Pinworms cause few or no
symptoms besides a mild gastrointestinal upset and perianal itching, which can
lead to bacterial infections. Pinworms are highly contagious and can be trans-
mitted in bed linens and clothing that has been contaminated with eggs. A com-
mon pinworm isEnterobius vermicularis. Also known as E. vermicularis, it
is the most common pinworm in the United States. E. vermiculariscauses
enterobiasis, in which the skin around the anus is so itchy that a person might
not be able to sleep.Quiz
- Helminths are
(a) fungi
(b) algae
(c) protozoa
(b) worms