Strongyloides stercoralis

Question 1

common name

Answer 1

threadworm

Question 2

order

Answer 2

rhabditida

Question 3

consider as what kind of disease?

Answer 3

neglected tropical disease

Question 4

further development in a ________________ environment of rhabditiform larva in feces or soil

Answer 4

moist

Question 5

broadly fusiform (0.7-1 mm x 40-50 um)

Answer 5

rhabditoid male

Question 6

two copulatory spicules and gubernaculum

Answer 6

rhabditoid male

Question 7

two-horned uterus or bihornuate uterus

Answer 7

rhabditoid female

Question 8

tail of rhabditoid male

Answer 8

pointed and curved ventrad

Question 9

undergoes 3 molts to form the free-living adult

Answer 9

diagnostic stage

Question 10

difference of rhabditiform larva and hookworm

Answer 10

buccal cavity is shorter than hookworm

Question 11

long esophagus, notched tail

Answer 11

filariform larva

Question 12

used by the larva to enter the cutaneous blood vessels

Answer 12

skin penetration

Question 13

larva are carried to the lungs via the ____________________

Answer 13

blood stream

Question 14

parasite may invade, mature and lay eggs in the stomach or lungs

Answer 14

immunosuppresed host

Question 15

difference of filariform larva and hookworm

Answer 15

esophagus of filariform is long and tail is notched

Question 16

2.7 mm long x 30-40 um wide

Answer 16

parisitic female

Question 17

anal opening

Answer 17

midventral

Question 18

eggs description

Answer 18

thin-shelled, transparent

Question 19

pathways of filariform larva (3)

Answer 19

reinfection, immunosuppressed and intestines

Question 20

immunosuppressing initiates what?

Answer 20

internal reinfection

Question 21

infective stage of filariform larva

Answer 21

skin penetration

Question 22

diagnostic stage

Answer 22

most common: rhabditiform larva

Question 23

most prominent lab finding

Answer 23

eosinophilia

Question 24

3 phases according to the life cycle

Answer 24

cutaneous, pulmonary, intestinal

Question 25

parasite may migrate through the skin and establish invasion in the intestines with ____________________________

Answer 25

no lung migration

Question 26

racing larva

Answer 26

larva currens

Question 27

coincide with lung migration

Answer 27

pulmonary

Question 28

sloughing of mucosa

Answer 28

intestinal

Question 29

immunocompromised host + high worm burden

Answer 29

hyperinfection

Question 30

lab finding

Answer 30

absence of periperal eosinophilia

Question 31

marker of hyperinfection

Answer 31

absense of periperal eosinophilia

Question 32

treatment

Answer 32

ivermectin and albendazole

Question 33

prevention

Answer 33

avoid contact with infected soil