hookworm Flashcards
complex ovejector, sphincter
female
caudal bursa, pair of spicules
male
has claviform esophagus
hookworm
hookworm also known as
bursate nematodes
meaning of bursate
phasmids
two most common type
ancylostoma duodenale and necator americanus
has ventral cutting plates
necator americanus
has ventral cutting teeth
ancylostoma duodenale
most common in the philippines
necator americanus
common name for ancylostoma duodenale
old world hookworm
size of adult male (ancylostoma duodenale)
8-11 mm x 0.6 mm
size of female (duodenale)
10-13mm x 0.6 mm
identifying feature
subterminal anal opening, conoid sheath
average daily output of eggs
25k to 30k eggs/day
very helpful in identifying a particular hookworm
teeth
two fused teeth
ventral
dental plate with median cleft
dorsal
eggs hatch in 1-2 days to release what kind of larva
rhabditoid larva
diagnostic stage
rhabditoid larva
infective stage
filariform larva
5-8 days to form what kind of larva
filariform larva
buccal cavity of hookworm
long
genital primordium of hookworm
small/incospicuous
esophagus
short
tail
pointed
size of male ancylostoma brasiliense
8 mm long
shape of bursa
square
size of female ancylostoma brasiliense
10mm long
diagnostic for a.brasiliense
buccal capsule
one pair of inconsipicuous median teeth
a.brasiliense
produces cutaneous larva
ancylostoma brasiliense
size of male (ancylostoma caninum)
10 mm
size of female (ancylostoma caninum)
14 mm
bursa with moderately slender rays
male a.caninum
buccal capsule (a.caninum)
3 pairs of ventral teeth
common parasite of dogs, causes creeping eruption
ancylostoma caninum
common name for necator americanus
american hookworm
does not contain any teeth but cutting plates
small buccal capsule
size of necator americanus (male)
7-9 mm x 0.3 mm
female size (necator americanus)
9.11 mm x 0.4 mm
eggs description
shell very thin
has tolerance to high temperatures
necator
prevalent in low temp
ancylostoma
form soil-feces mixture, favors larval development and affect overall prevalence of infection
dung beetle
presence of papular lesion
ground itch
also known as creeping eruption
cutaneous larva migrans
most common cause for cutaneous larva migrans
ancylostoma brasiliense
red then becomes elevated
itching papules
scratching allows colonization of pyogenic organisms
pruritus
able to infect by mouth
larvae of a. brasiliense/caninum
extensive infection of larvae of brasiliense and caninum
pneomonitis
crystals in the sputum
charcot-leyden
syndrome cause by migrating larvae
wakana disease
can be due to massive larval migration
pneumonitis
low degree of sensitization
typical pneumonitis
ultimate result of hookworm infection
microcytic, hypochromic anemia
treatment
albendazole
treatment for creeping eruption
thiabendazole
treatment for wakana disease
adrenocorticoids
prevention
sanitary disposal of human feces