Paper II
2025 March (Supplementary (SAY)) (2019 Scheme) · 100 marks · 180 min

Question

Autoinfection is noted in

  1. Trichruis trichuria
  2. Stronglyloides steroralis
  3. Enterobious vermicularis
  4. Taenia solium a) 1, 2, 3, 4 are correct c) 2, 3, 4 are correct b) 1, 2, 3 are correct d) 2, 4 are correct
  • a) 1, 2, 3, 4 are correct
  • c) 2, 3, 4 are correct
  • b) 1, 2, 3 are correct
  • d) 2, 4 are correct
Qviii1.8 marksMCQs (Multi)

Answer

Autoinfection — where larvae/eggs from an established infection re-infect the same host without requiring external re-exposure — is a genuinely distinctive feature of a small number of parasites. The classic example is Strongyloides stercoralis: some larvae transform into the infective filariform stage while still within the gut or on perianal skin, and re-penetrate the intestinal mucosa or perianal skin directly, re-entering the pulmonary migration cycle without ever leaving the host — allowing infection to persist and self-perpetuate for decades, and, in the immunocompromised (particularly with corticosteroid therapy), to accelerate into life-threatening hyperinfection syndrome. Hymenolepis nana and Enterobius vermicularis (via perianal egg deposition and scratching leading to hand-to-mouth reinfection, sometimes termed retroinfection for Enterobius) are other organisms in which autoinfection/self-reinfection phenomena are recognized. Taenia solium cysticercosis can also occur via autoinfection (a tapeworm carrier ingesting their own eggs). Without the original four numbered statements from the source question, the specific combination intended by the examiner cannot be confirmed.

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