Nematodes Flashcards
(118 cards)
what types of parasites will be covered in nematodes
intestinal roundworms (geohelmenths)
what parasite has the most infected individuals
ascaris
what is the phylum, class, order, family, genus, and species for ascaris
nematoda, secernentia, ascaridata, ascaridae, ascaris, ascaris lumbricoides
what is a geohelmenth
parasite that spends part of its life cycle in the soil
what other parasite does ascaris tend to coexist with
Trichuris trichiura
where is ascaris endemic to
warm countries especially in areas of poor sanitation
what age group is ascaris typically found in and why
school aged children because they play in dirt
what key factor spreads ascaris rapidly
indescriminate defecation
whats the common name for ascaris
large intestinal roundworm
how long are female and male ascaris
female: 20-50cm, male: 15-30cm
what key factor do males have of ascaris
curved ventral tail
how many eggs can female ascaris produce per day
200,000
how many eggs can a female have in her body at one time
27 million
why do ascaris eggs remain viable for long periods of time
resistant to harsh weather and chemicals (due to hard outer covering of egg)
what is the infective stage of ascaris
the fertilized egg
what kind of covering does ascaris fertilized eggs have
coarse mammillated albuminous covering on top of a thick yellow-brown chitinous shell
what is the method of diagnosis for ascaris
recover and identify characteristic eggs from feces
what harm can ascaris cause to the body
enlarge liver (hepatitis), blockage of intestines, can cause pneumonia, perforate intestines, blockage of bile ducts (peritonitis), cholangitis (colon), pancreatitis
how is one exposed to ascaris
ingestion
what path does ascaris take to become an adult
hatch in the small intestine, enter bloodstream, pass the liver, pass the heart, pass the capilaries of the lungs, migrate up the respiratory tree, swallowed, migrate to the small intestine where it develops into an adult
what is a heavy infection of ascaris
less than 500 adults
what is the disease name for ascaris
ascariasis
what do medications do to parasites?
kill eggs and trigger adults to exit from the hosts body
what medications can be used to treat ascariasis
100mg x 3 doses of mebandazole
11mg/kg ounce of pyrantel pamoate
400mg of albendazole