Question 1

Which stage of the hookworm infection cycle is responsible for penetrating human skin?

Accepted Answer

Filariform larva

Question 2

A patient presents with severe anal itching. Which type of worm infestation is most likely responsible?

Accepted Answer

Pinworms

Question 3

Which of the following best describes the transmission route of schistosome infection in humans?

Accepted Answer

Penetration of skin by cercariae in water

Question 4

What is the correct sequence of the tapeworm infection cycle in humans?

Accepted Answer

Eggs in feces → cysticercus develops in pig → inadequately cooked meat ingested → cysts develop in human intestine

Question 5

Which equation best represents the relationship between the number of eggs passed in feces ($$E) $$and the number of adult tapeworms ($$A) in $$the human intestine, assuming each adult produces $$n$$ eggs per day?

Accepted Answer

$$E = n 	imes A$$

Question 6

Which of the following is a major health risk associated with filarial worm infestation?

Accepted Answer

Blockage of blood vessels leading to possible death

Question 7

During the schistosome infection cycle, which stage migrates through the liver and matures into adults?

Accepted Answer

Schistosomulae

Question 8

A farmer develops a hookworm infection after working barefoot in a field. Which stage of the parasite is most likely responsible for the infection?

Accepted Answer

Filariform larva

Question 9

Which of the following best explains why inadequately cooked pork can lead to tapeworm infection in humans?

Accepted Answer

Cysticerci in pork survive cooking and develop into adult tapeworms in the human intestine

Question 10

Which stage of the schistosome life cycle is released into water from human feces?

Accepted Answer

Eggs

Question 11

If a population of pigs is exposed to human feces containing tapeworm eggs, which stage develops in the pig before transmission to humans?

Accepted Answer

Cysticercus

Question 12

Which of the following is NOT a correct pairing of worm type and associated health risk?

Accepted Answer

Filarial worms: cause liver cirrhosis

Question 13

Which stage of the schistosome infection cycle penetrates the snail tissue?

Accepted Answer

Miracidia

Question 14

A child is diagnosed with pinworm infection. Which of the following is the most likely symptom?

Accepted Answer

Severe anal itching

Question 15

Which of the following steps is unique to the schistosome life cycle compared to hookworm and tapeworm cycles?

Accepted Answer

Development in a snail intermediate host

Question 16

If $$N$$ cercariae penetrate human skin and only $$p$$ percent mature into adult schistosomes, what is the expected number of adult schistosomes formed?

Accepted Answer

$$N 	imes \frac{p}{100}$$

Question 17

Which of the following is the correct order of events in the schistosome infection cycle?

Accepted Answer

Eggs in feces → miracidia penetrate snail → cercariae released into water → cercariae penetrate human skin → schistosomulae migrate to liver

Question 18

Which stage of the hookworm life cycle is found in the environment and is infectious to humans?

Accepted Answer

Filariform larva

Question 19

A community experiences an outbreak of schistosomiasis. Which environmental factor is most likely contributing to the spread?

Accepted Answer

Presence of contaminated water with snails

Question 20

Which of the following is a multi-step process that occurs in the tapeworm life cycle before human infection?

Accepted Answer

Eggs passed in human feces → pig ingests eggs → cysticerci develop in pig → human ingests undercooked pork

Helminth Infection Cycles and Pathogenicity

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