Nemathelminthes

Question 1

Location of Enterobius vermicularis

Answer 1

intestinal/anal, adults in colon

Question 2

Location of Trichuris trichiuria

Answer 2

intestine/colon, adults attach to colonic mucosa

Question 3

Location of Ascaris lumbricoides

Answer 3

intestinal, soil

Adults free in upper intestine

Question 4

Location of Necator americanus

Answer 4

intestinal soil

Question 5

Location of Strongyloides stercoralis

Answer 5

intestinal soil

Question 6

Location of Trichinella spiralis

Answer 6

muscle

Question 7

Location of Toxocara canis

Answer 7

blood/tissue

Question 8

Transmission of Enterobius vermicularis

Answer 8

direct egg fecal/oral

ingestion of eggs (direct person to person)

Question 9

Transmission of Trichuris trichiuria

Answer 9

soil egg fecal/oral

ingestion of embryonated eggs

no drect person to person

Question 10

Transmission of Ascaris lumbricoides

Answer 10

egg facal/oral

Ingestion of eggs from soil, no direct person to person

Question 11

Transmission of Necator americanus

Answer 11

larva invades skin

Question 12

Transmission of Strongyloides stercoralis

Answer 12

larva invades skins or autoinfective larvae

Question 13

Transmission of Trichinella spiralis

Answer 13

undercooked pork

Question 14

Transmission of Toxocara canis

Answer 14

soil egg fecal/oral

Question 15

Definitive host of Enterobius vermicularis

Answer 15

Humans, no intermediate host needed

Question 16

Epidemiology of Enterobius vermicularis

Answer 16

>200 million worldwise with >20 million in US

More prevalent in children, daycare centers, etc.

Question 17

Pinworm, species name

Answer 17

Enterobius vermicularis

Question 18

Pathology of Enterobius vermicularis (pinworm)

Answer 18

Itchy anus

Secondary infections from scratching

Rare bacterial infection in females due to urogential invasion

Psychological trauma

Question 19

Immunity of Enterobius vermicularis

Answer 19

None (reinfection is possible and common)

Question 20

Diagnosis of pinworm (Enterobius vermicularis)

Answer 20

Persistent perianal itch, restlessness, insomia

Confirm by observation of eggs (scotch tape test)

Question 21

Whipworm, species name

Answer 21

Trichuris trichiura

Question 22

Definitive host of Trichuris trichiura (whipworm)

Answer 22

Humans only

Question 23

Epidemiology of Trichuris trichiura (whipworm)

Answer 23

Up to 800,000 people infected worldwise

Tropical countries, poorer communities in South US

Poor public hygiene, use of human waste as fertilizer

Question 24

Diagnosis of whipworm (Trichuris trichuria)

Answer 24

Only by eggs in stool

Question 25

Definitive host of Ascaris lumbricoides

Answer 25

Humans

Question 26

Epidemiology of Ascaris lumbricoides

Answer 26

Up to 25% of people worldwide Tropical and subtropical Up to 4 million in the US, Appalachia, and south Considered a _US Neglected Disease of Poverty_ Poor public hygiene, use of _human waste as fertilizer_

Question 27

Which of the worms enter the venous circulation to the lungs and are coughed up & swallowed?

Answer 27

Ascaris lumbricoides Hookworm (Necator amercanus) Strongyloides stercoralis

Question 28

Which worms, when stressed, can migrated to the nose, ear & peritoneal thru body wall?

Answer 28

Ascaris lumbricoides

Question 29

What is pruitus?

Answer 29

From hookworms itch is defined as an unpleasant sensation of the skin that provokes the urge to scratch

Question 30

Which of the worms larva stage in the lungs can cause bronchitis?

Answer 30

Hookworm (Necator americanus)

Question 31

Which worm causes anemia?

Answer 31

Hookworm (Necator americanus)

Question 32

Larvae in the feces

Answer 32

Strongyloides stercoralis

Question 33

Rash on buttocks, legs and lower back due to autoinfection

Answer 33

Strongyloides stercoralis