Question

Which nematode is not acquired by ingestion?

a. Ascaris lumbricoides

b. Strongyloides stercoralis

c. Trichuris trichuria

d. Enterobius vermicularis

Clear my choice

Answer 1

Option 'b' (Strongyloides stercoralis) is NOT acquired by ingestion.

Justification: The nematode Strongyloides stercoralis causes 'Strongyloidiasis' and it is transmitted through direct penetration of human skin when contacted with the soil. It is caused by infective larvae and it can be easily transmitted while walking barefoot. So, Strongyloides stercoralis is NOT acquired by ingestion but is acquired through direct penetration of human skin.

Justification for other options:

• Options 'a' and 'c' are true because Ascaris lumbricoides and Trichuris trichuria are acquired by ingestion when eggs are swallowed from contaminated soil with faeces.
• Option 'd' is true because Enterobius vermicularis is acquired by ingestion when infected eggs from the buttocks are transferred directly by hand to the mouth of same or another person.

Thank you!