During an outbreak in a rural village, one group of children develops watery diarrhoea and vomiting after viral gastroenteritis, while another group presents with hallucinations, a sensation of insects crawling under the skin, and blackened fingertips after eating contaminated rye bread. Which of the following best explains the difference in clinical presentation?

Question

BlackTom AI · Accepted Answer

The question asks us to distinguish why one group of children has watery diarrhoea and vomiting while another group has hallucinations and vasospasm after eating contaminated rye bread.
Option 1: 'Viral gastroenteritis causes diarrhoea via serotonin receptor blockade, whereas Alpha-amanitin increases central serotonin release leading to hallucinations' This is inaccurate on two counts. First, viral gastroenteritis does not cause diarrhoea through serotonin receptor blockade; it typically damages enterocytes and disrupts fluid and electrolyte absorption. Second, alpha-amanitin (a toxin from some poisonous mushrooms) does not primarily cause hallucinations via increased central serotonin release. Its main action is inhibition of RNA polymerase II, leading to liver and GI toxicity, not a hallmark of the described clinical picture. Overall, this option misstates the mechanisms of both entities.
Option 2: 'Viral infections cause watery diarrhoea by villous atrophy, whereas clostridial α-toxin mediates the gangrene seen in ergotism' This mixes up the pathophysiology. Viral enteric infections do not typically cause villous atrophy as the primary mechanism for watery diarrhoea in this context; they impair absorptive function and cell integrity, but villous atrophy is more characteristic of chronic enteropathies or certain infections like celiac disease. Moreover, ergotism is due to ergot alkaloids causing vasoconstriction and hallucinations; clostridial α-toxin is not the classic mediator of ergotism gangrene. Hence, this option provides an incorrect linkage between the pathogens and the clinical signs.
Option 3: 'Both conditions are mediated by excess serotonin in the gut, but alflatoxins additionally cause direct hepatotoxicity' This is incorrect because the diarrhoeal illness in the question is due to viral enteric infection, not a serotonin-overload condition in both cases. Also, aflatoxins are mycotoxins that cause hepatotoxicity, but they are not the central factor here, and ergotism is not caused by aflatoxins. The statement wrongly conflates mechanisms and toxins.
Option 4: 'Viral enteric infection damages enterocytes leading to fluid loss, whereas ergot alkaloids act as 5-HT2A receptor agonists causing hallucinations and vasospasm' This option accurately captures the contrast: viral enteric infection damages intestinal enterocytes, disrupting fluid absorption and causing watery diarrhoea and vomiting; ergot alkaloids (found in contaminated rye) stimulate 5-HT2A receptors, producing hallucinations and vasospasm. The clinical presentation aligns with known pathophysiology of ergot poisoning (ergotism) and viral gastroenteritis, making this the correct conceptual pairing among the choices.

MEDS2012 (ND) Module 1 Quiz Wednesday AM

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